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The global threat of Zika virus to pregnancy: epidemiology, clinical perspectives, mechanisms, and impact
© The Author(s). 2016
- Received: 3 June 2016
- Accepted: 27 July 2016
- Published: 3 August 2016
Zika virus (ZIKV) is a mosquito-borne flavivirus that has newly emerged as a significant global threat, especially to pregnancy. Recent major outbreaks in the Pacific and in Central and South America have been associated with an increased incidence of microcephaly and other abnormalities of the central nervous system in neonates. The causal link between ZIKV infection during pregnancy and microcephaly is now strongly supported. Over 2 billion people live in regions conducive to ZIKV transmission, with ~4 million infections in the Americas predicted for 2016. Given the scale of the current pandemic and the serious and long-term consequences of infection during pregnancy, the impact of ZIKV on health services and affected communities could be enormous. This further highlights the need for a rapid global public health and research response to ZIKV to limit and prevent its impact through the development of therapeutics, vaccines, and improved diagnostics. Here we review the epidemiology of ZIKV; the threat to pregnancy; the clinical consequences and broader impact of ZIKV infections; and the virus biology underpinning new interventions, diagnostics, and insights into the mechanisms of disease.
- Economic cost
- Public health
ZIKV is a flavivirus that is primarily transmitted by daytime-active mosquitoes of the Aedes spp. Other routes of transmission have been reported, including sexual transmission, with low rates of transmission from oral and anal sex also described [2–7]. ZIKV was first identified in a rhesus macaque in the Zika forest in Uganda in 1947 . The first evidence that ZIKV could infect humans came from serological surveys conducted in Uganda . Evidence of sporadic human infections was then demonstrated across Africa and parts of South-East Asia, but the first major ZIKV outbreak described was in 2007 on the island of Yap in the Federated States of Micronesia. In that epidemic, it was estimated that >73 % of the total population was infected . Since 2007, ZIKV has continued its eastward migration, detected in French Polynesia in 2012–14, the Easter Islands (Chile) in 2014, and Brazil in 2015, where between 500,000 and 1.5 million cases of Zika have occurred. ZIKV transmission has now been documented in 66 countries and territories; since 2015, 49 countries and territories previously ZIKV-negative have experienced their first reported ZIKV outbreak .
The rapidly expanding distribution of ZIKV and its potentially high penetrance in newly affected populations pose very significant threats to pregnant women and their fetuses in many regions. The first trimester of pregnancy is a crucial period for brain development and ZIKV infection early in pregnancy is likely to be more strongly associated with microcephaly than infections later in pregnancy, as demonstrated in French Polynesia . Consequently, the impact of the expansion of ZIKV to previously unexposed populations may not be perceived for a number of months, as seen in the delayed observations of microcephaly and fetal malformations in French Polynesia  and Brazil . As of 25 June 2016, in Brazil, there were 8165 reported cases of microcephaly suspected to be associated with ZIKV infection, of which 5104 have been investigated and 1638 (32 %) were confirmed to be linked to ZIKV . Modeling data from French Polynesia revealed that the risk of microcephaly from infection in the first trimester was 1 % . This estimation relied on passive surveillance of only ~30 % of general practice clinics and is likely to be an underestimation of the actual risk given that some mothers could have had a miscarriage or stillbirth or may not have presented for clinical care. Such data from the Brazil outbreak are not yet available. This relatively low risk has to be balanced with the large population exposure and high incidence of ZIKV in some regions (e.g., ~70 % in French Polynesia  and Yap ). The reasons why microcephaly and other congenital complications associated with ZIKV have become prominent in recent outbreaks is currently unclear. It may be explained by specific mutations in ZIKV strains causing recent epidemics, and/or host or other cofactors. The enormous size of recent and ongoing epidemics has also aided the detection of complications.
The WHO predicts up to 4 million ZIKV infections in 2016 in the Americas alone  and initial modeling suggests that up to 2.17 billion people live in areas conducive to ZIKV transmission . Given the potential enormous scale of the issue, greater attention needs to be given to the public health consequences and likely economic impacts of an increased number of children with microcephaly and other neurological and ocular abnormalities [38, 39]. These abnormalities, as well as microcephaly, are strongly associated with intellectual impairment, seizures, visual and hearing impairment, feeding difficulties, and significant developmental delay, signifying a poor prognosis for affected children with many unable to talk or walk [40–42]. As mentioned above, ZIKV infections in adults have also been linked with Guillain–Barré syndrome, a potentially debilitating and serious complication.
ZIKV could potentially impact on the economies of affected countries, such as through reduced tourism and impact on trade . However, there has been little focus on the economic impact to the health system and implications regarding cost of treatment, and the loss of productivity of affected children and their carers. Disability is associated with lower educational attainment, higher unemployment, and additional financial costs for families . These financial costs are at times over 40 % of household income, representing a potentially catastrophic health expense that may drive some households into poverty and perpetuate the cycle of entrenched poverty and poor health [44, 45]. Providing appropriate healthcare and support services for these children will further stretch already overburdened health systems. Quantifying this burden on a society, health system, and economy is difficult due to the paucity of available data, but it is likely to be substantial. Evidence emerging from Brazil describes families struggling to access appropriate specialist services and treatment, a situation further exacerbated by Brazil’s current economic downturn [46, 47]. Dengue virus, a related flavivirus also transmitted by Aedes spp., caused around 58 million symptomatic infections in 2013, and is thought to have cost US$8.9 billion to the global economy in 2013 . The epidemiological and clinical differences between Dengue virus and ZIKV limit the generalizability of this cost estimate; however, it does highlight the potential scale of economies that could be at stake. For example, since January 2012, the Pacific region has experienced a major surge in mosquito-borne diseases with concurrent epidemics of dengue, chikungunya, and ZIKV infections affecting all 22 Pacific island countries and territories . There is also a pressing need to assess the implications of ZIKV on global maternal and child health, and to ensure an equitable and accessible provision of quality, comprehensive care for affected families.
A strong knowledge of ZIKV biology is important for the development of vaccines, therapeutics, and better diagnostics. Recently, cryo-electron microscopy revealed the architecture of ZIKV strain H/PF/2013 isolated in Micronesia in the 2013–14 outbreak, confirming its structural analogy with other flavivirus members . Similar to other flaviviruses, ZIKV is an icosahedral enveloped virus with an ~11 kb positive-sense RNA genome encoding a single polyprotein of 3417–3423 amino acids. The polyprotein encodes three structural proteins [capsid (C), precursor membrane (prM), and envelope protein (E)] and seven nonstructural proteins (NS1, NS2A, NS2B, NS3, NS4A, NS4B, and NS5 proteins), which are derived by cleavage of the large polyprotein by proteases. By analogy to other flaviviruses, viral entry of ZIKV into host cells is assumed to involve the specific binding of viral surface glycoprotein E to cellular receptors, followed by endocytosis, viral fusion, and delivery of the nucleocapsid into the cytoplasm. Viral replication occurs in the cytoplasm and viral assembly occurs in the endoplasmic reticulum . The ectodomain of the ZIKV glycoprotein E comprises a typical three-domain organization (domain I, II, and III). The fusion loop resides at the tip of domain II and is important for viral fusion with the host-cell membrane during viral entry. Domain III is connected via the stem region to the transmembrane domain (TMD) that anchors the glycoprotein E to the viral membrane [50, 52, 53]. The region surrounding the Asn154 glycan of the glycoprotein E shows the biggest structural deviation from the dengue virus envelope glycoprotein as a result of an insertion of two N-terminal and four C-terminal residues flanking Asn154. In the related West Nile virus, the Asn154 glycan is associated with neurovirulence in isolates obtained post-1999; mouse-adapted strains with poor neurovirulence lack a glycan at this position . Further study on the role of the Asn154 glycan in ZIKV are required to examine whether it plays a role in ZIKV neurovirulence. Understanding the nature and function of these proteins and glycans is important for developing novel anti-ZIKV drugs and vaccines.
At this stage, a number of vaccine approaches are being pursued, including DNA-based and recombinant protein subunit vaccines. Live attenuated vaccines are also promising, being modeled off work for yellow fever and dengue viruses. Given recent findings in animal models, a vaccine for ZIKV appears to be a feasible proposition. A study conducted in Balb/c mice showed that a single vaccination of DNA encoding the full-length prM-E region of the BeH815744 strain from Brazil afforded complete protection 4 or 8 weeks later from a challenge dose of 102 plaque-forming units (pfu) of either a ZIKV isolate from Brazil (ZKV2015) or an isolate from Puerto Rico (PRVABC59), two strains from the Asian lineage that differ by five amino acids . Truncation of the prM-E region to remove either the TMD of glycoprotein E or the TMD and stem region of glycoprotein E, or immunization with full-length glycoprotein E alone, TMD-truncated glycoprotein E, or TMD and stem-truncated glycoprotein E were not protective; however, viral loads were lower compared to those in sham-vaccinated animals. Analysis of the correlates of protection revealed that glycoprotein E-specific antibody titers correlated with protection and inversely correlated with viral load in challenged animals. The protective efficacy of this vaccine was mediated by IgG, as demonstrated by the fact that passive transfer of IgG into naïve animals was protective, and depletion of CD4+ T cells, CD8+ T cells, or CD4+ and CD8+ T cells did not alter the level of protection afforded by the vaccine.
These observations were extended to a conventional vaccine platform using an inactivated purified ZIKV vaccine (Puerto Rico PRVABC59 strain). Immunization of Balb/c mice with the vaccine (formulated with alum as the adjuvant) generated neutralizing antibodies and all animals were protected when challenged with the Brazilian ZKV2015 strain . It is important to note that the Brazilian ZKV2015 strain used in these challenge studies has been demonstrated to cause fetal microcephaly and intrauterine growth restriction in wild-type SJL mice . In addition, while the Balb/c mice used by Larocca et al.  did not have a fatal outcome from infection, viremia was detected and its duration was similar to that observed in human infections of ZIKV. How these findings will translate to humans and the prevention of microcephaly is unclear, but these findings provide a proof of concept that it will be possible to develop a ZIKV vaccine for clinical evaluation in humans using a nonreplicating vaccine.
The current tools available to accurately diagnose ZIKV infections are limited, and there is a need for highly specific point-of-care tests for ZIKV detection and improved serological tools for clinical diagnosis and population-based surveillance [57, 58]. Available diagnostics have mainly been used to test symptomatic individuals and it is unclear how they perform in asymptomatic individuals, who comprise ~80 % of infected individuals and who may be important reservoirs for virus transmission . These diagnostic uncertainties are especially important for pregnant women who may infect their fetus, with severe consequences for fetal development, despite having asymptomatic infections themselves. Therefore, and in accordance with recent CDC guidelines for testing pregnant women with possible ZIKV exposure, there is a strong justification for testing asymptomatic at-risk pregnant women as long as laboratory capacity is adequate . These at-risk women include those who have traveled to areas with active ZIKV transmission and those who have had sex without a condom with a male partner with possible ZIKV exposure, especially if they or their partner develop symptoms or signs of ZIKV disease.
Anti-ZIKV antibodies are highly cross-reactive as a result of antigenic relatedness between ZIKV and other flaviviruses such as dengue, Japanese encephalitis, West Nile virus, Kunjin virus, yellow fever, Murray Valley encephalitis, and others that often co-circulate with ZIKV . Cross-reactivity with antibodies induced from vaccination with yellow fever and Japanese encephalitis vaccines can also occur . These limitations in current serological assays remain a major obstacle for individual diagnostics and screening, as well as population-based serosurveillance. The detection of circulating antigen(s) is currently not available for ZIKV, but this approach is likely to be valuable because the period of antigenemia extends beyond the period of viremia. In dengue, detection of NS1 antigen has been used for direct virus detection, and IgM-specific reactivity adds specificity. Various technology platforms are exploring ways of multiplexing serological responses to a range of flaviviruses and other co-circulating arboviruses [62, 63].
As with other arboviruses, viral culture itself is possible, but is impractical for routine diagnostic use. Plaque reduction neutralization assays (PRNT) may be used as confirmatory assays if there is no prior evidence of previous flavivirus infection or vaccination with a flavivirus vaccine as the potential for cross-reactivity of antibodies acquired from exposure to other flaviviruses can be problematic. Nucleic acid amplification methods like reverse transcription (RT) PCR remain the main diagnostic approach in acutely symptomatic individuals owing to their high sensitivity and specificity. The viremia period extends from a brief pre-patent period and commonly continues for 3–5 days after the onset of symptoms [64–66], but may extend for up to 11 days [60, 67]. RT-PCR can also be used to detect ZIKV in amniotic fluid , breast milk [69, 70], semen , and saliva , and may be used to screen blood products. Given that ZIKV can be found in urine for up to 7 days longer than in serum, urine may be a more useful sample when there are delays in presentation [73, 74]. With proven or suspected microcephaly, testing for other etiological factors is important, including rubella, cytomegalovirus (CMV), toxoplasmosis, herpes simplex virus, varicella zoster virus, HIV, and chikungunya virus, as well as excluding other noninfectious causes. PCR assays are often used with consensus primers targeting multiple flaviviruses, followed by sequencing or ZIKV-specific PCR. Generic flavivirus PCRs may suffer from lower sensitivity compared to species-specific PCR, but it provides a practical screening tool, especially when a range of other infections need to be considered.
ZIKV has recently emerged as a major global threat to pregnancies, and there is now strong evidence linking ZIKV infection with microcephaly and other significant congenital abnormalities. Given the serious congenital complications that can arise from ZIKV infection and the substantial long-term consequences of these, a strong and rapid global public health and research response to the virus is essential to limit and prevent the major health, social, and economic impact of the virus, and to advance the development of therapeutics, vaccines, and improved diagnostics. This will require substantial ongoing funding commitments. Moreover, the current Zika crisis is a salient reminder of the ongoing threat to human health posed by infectious pathogens.
We acknowledge the help of Tracy Parish (Burnet Institute) for preparation of the figure, and Mike Toole (Burnet Institute) for reviewing the manuscript.
Funding was provided by the National Health and Medical Research Council (NHMRC) of Australia (Early Career Fellowship to JSR, Senior Research Fellowships and Project Grants to JGB and HED). The Burnet Institute is supported by the NHMRC Independent Research Institutes Infrastructure Support Scheme, and a Victoria State Government Operational Infrastructure Support grant. Funding bodies had no role in the design of the study or collection, analysis, and interpretation of data or in writing the manuscript.
All authors contributed to the planning, writing, and revision of the manuscript. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
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- Duffy MR, Chen TH, Hancock WT, Powers AM, Kool JL, Lanciotti RS, Pretrick M, Marfel M, Holzbauer S, Dubray C, et al. Zika virus outbreak on Yap Island, Federated States of Micronesia. N Engl J Med. 2009;360(24):2536–43.View ArticlePubMedGoogle Scholar
- Deckard DT, Chung WM, Brooks JT, Smith JC, Woldai S, Hennessey M, Kwit N, Mead P. Male-to-male sexual transmission of Zika virus - Texas, January 2016. MMWR Morb Mortal Wkly Rep. 2016;65(14):372–4.View ArticlePubMedGoogle Scholar
- Foy BD, Kobylinski KC, Chilson Foy JL, Blitvich BJ, Travassos da Rosa A, Haddow AD, Lanciotti RS, Tesh RB. Probable non-vector-borne transmission of Zika virus, Colorado, USA. Emerg Infect Dis. 2011;17(5):880–2.View ArticlePubMedPubMed CentralGoogle Scholar
- Musso D, Nhan T, Robin E, Roche C, Bierlaire D, Zisou K, Shan Yan A, Cao-Lormeau VM, Broult J. Potential for Zika virus transmission through blood transfusion demonstrated during an outbreak in French Polynesia, November 2013 to February 2014. Euro Surveill. 2014;19(14).Google Scholar
- Musso D, Roche C, Robin E, Nhan T, Teissier A, Cao-Lormeau VM. Potential sexual transmission of Zika virus. Emerg Infect Dis. 2015;21(2):359–61.View ArticlePubMedPubMed CentralGoogle Scholar
- Mansuy JM, Dutertre M, Mengelle C, Fourcade C, Marchou B, Delobel P, Izopet J, Martin-Blondel G. Zika virus: high infectious viral load in semen, a new sexually transmitted pathogen? Lancet Infect Dis. 2016;16(4):405.View ArticlePubMedGoogle Scholar
- Freour T, Mirallie S, Hubert B, Splingart C, Barriere P, Maquart M, Leparc-Goffart I. Sexual transmission of Zika virus in an entirely asymptomatic couple returning from a Zika epidemic area, France, April 2016. Euro Surveill. 2016;21(23). doi:10.2807/1560-7917.ES.2016.21.23.30254.
- Dick GW, Kitchen SF, Haddow AJ. Zika virus. I. Isolations and serological specificity. Trans R Soc Trop Med Hyg. 1952;46(5):509–20.View ArticlePubMedGoogle Scholar
- Dick GW. Epidemiological notes on some viruses isolated in Uganda; Yellow fever, Rift Valley fever, Bwamba fever, West Nile, Mengo, Semliki forest, Bunyamwera, Ntaya, Uganda S and Zika viruses. Trans R Soc Trop Med Hyg. 1953;47(1):1348.View ArticleGoogle Scholar
- All Countries & Territories with Active Zika Virus Transmission [https://www.cdc.gov/zika/geo/active-countries.html]. Accessed 8 Jan 2016.
- Passemard S, Kaindl AM, Verloes A. Microcephaly. Handb Clin Neurol. 2013;111:129–41.View ArticlePubMedGoogle Scholar
- Kliegman RM, Stanton BF, St Geme III JW, Schor NF. Nelson Textbook of Pediatrics. 20th ed. Philadelphia: Elsevier; 2016.Google Scholar
- Rios A. Microcephaly. Pediatr Rev. 1996;17(11):386–7.PubMedGoogle Scholar
- Society for Maternal-Fetal Medicine Publications Committee. Ultrasound screening for fetal microcephaly following Zika virus exposure. Am J Obstet Gynecol. 2016;214(6):B2–4.View ArticleGoogle Scholar
- Cavalheiro S, Lopez A, Serra S, Da Cunha A, da Costa MD, Moron A, Lederman HM. Microcephaly and Zika virus: neonatal neuroradiological aspects. Childs Nerv Syst. 2016;32(6):1057–60.View ArticlePubMedPubMed CentralGoogle Scholar
- de Fatima Vasco Aragao M, van der Linden V, Brainer-Lima AM, Coeli RR, Rocha MA, Sobral da Silva P, Durce Costa Gomes de Carvalho M, van der Linden A, Cesario de Holanda A, Valenca MM. Clinical features and neuroimaging (CT and MRI) findings in presumed Zika virus related congenital infection and microcephaly: retrospective case series study. BMJ. 2016;353:i1901.View ArticlePubMedPubMed CentralGoogle Scholar
- Hazin AN, Poretti A, Cruz DD, Tenorio M, van der Linden A, Pena LJ, Brito C, Gil LH, Miranda-Filho DB, Marques ET, et al. Computed tomographic findings in microcephaly associated with Zika virus. N Engl J Med. 2016;374(22):2193–5.View ArticlePubMedGoogle Scholar
- Willison HJ, Jacobs BC, van Doorn PA. Guillain-Barré syndrome. Lancet. 2016; S0140-6736(16)00339-1. doi:10.1016/S0140-6736(16)00339-1. [Epub ahead of print].
- Carod-Artal FJ, Wichmann O, Farrar J, Gascon J. Neurological complications of dengue virus infection. Lancet Neurol. 2013;12(9):906–19.View ArticlePubMedGoogle Scholar
- Cao-Lormeau V-M, Blake A, Mons S, Lastère S, Roche C, Vanhomwegen J, Dub T, Baudouin L, Teissier A, Larre P, et al. Guillain-Barré syndrome outbreak associated with Zika virus infection in French Polynesia: a case–control study. Lancet. 2016;387(10027):1531–9.View ArticlePubMedGoogle Scholar
- Cauchemez S, Besnard M, Bompard P, Dub T, Guillemette-Artur P, Eyrolle-Guignot D, Salje H, Van Kerkhove MD, Abadie V, Garel C, et al. Association between Zika virus and microcephaly in French Polynesia, 2013–15: a retrospective study. Lancet. 2016;387(10033):2152–32.View ArticleGoogle Scholar
- Kleber de Oliveira W, Cortez-Escalante J, De Oliveira WT, do Carmo GM, Henriques CM, Coelho GE, de Franca GV A. Increase in reported prevalence of microcephaly in infants born to women living in areas with confirmed Zika virus transmission during the first trimester of pregnancy - Brazil, 2015. MMWR Morb Mortal Wkly Rep. 2016;65(9):242–7.View ArticlePubMedGoogle Scholar
- Informe EpidemiolóGico No 32 [http://combateaedes.saude.gov.br/situacao-epidemiologica]. Accessed 8 Jan 2016.
- Rasmussen SA, Jamieson DJ, Honein MA, Petersen LR. Zika virus and birth defects - reviewing the evidence for causality. New Engl J Med. 2016;374(20):1981–7.View ArticlePubMedGoogle Scholar
- Frank C, Faber M, Stark K. Causal or not: applying the Bradford Hill aspects of evidence to the association between Zika virus and microcephaly. EMBO Mol Med. 2016;8(4):305–7.View ArticlePubMedPubMed CentralGoogle Scholar
- Brasil P, Pereira JJP, Raja Gabaglia C, Damasceno L, Wakimoto M, Ribeiro Nogueira RM, Carvalho de Sequeira P, Machado Siqueira A, Abreu de Carvalho LM, Cotrim da Cunha D, et al. Zika virus infection in pregnant women in Rio de Janeiro — preliminary report. New Engl J Med. 2016 [Epub ahead of print].Google Scholar
- Mlakar J, Korva M, Tul N, Popovic M, Poljsak-Prijatelj M, Mraz J, Kolenc M, Resman Rus K, Vesnaver Vipotnik T, Fabjan Vodusek V, et al. Zika virus associated with microcephaly. N Engl J Med. 2016;374(10):951–8.View ArticlePubMedGoogle Scholar
- Wu KY, Zuo GL, Li XF, Ye Q, Deng YQ, Huang XY, Cao WC, Qin CF, Luo ZG. Vertical transmission of Zika virus targeting the radial glial cells affects cortex development of offspring mice. Cell Res. 2016;26(6):645–54.View ArticlePubMedPubMed CentralGoogle Scholar
- Tang H, Hammack C, Ogden SC, Wen Z, Qian X, Li Y, Yao B, Shin J, Zhang F, Lee EM, et al. Zika virus infects human cortical neural progenitors and attenuates their growth. Cell Stem Cell. 2016;18(5):587–90.View ArticlePubMedGoogle Scholar
- Li C, Xu D, Ye Q, Hong S, Jiang Y, Liu X, Zhang N, Shi L, Qin CF, Xu Z. Zika virus disrupts neural progenitor development and leads to microcephaly in mice. Cell Stem Cell. 2016;19(1):120–6.View ArticlePubMedGoogle Scholar
- da Silva SR, Gao SJ. Zika virus update II: recent development of animal models - proofs of association with human pathogenesis. J Med Virol. 2016 [Epub ahead of print].Google Scholar
- Dowall SD, Graham VA, Rayner E, Atkinson B, Hall G, Watson RJ, Bosworth A, Bonney LC, Kitchen S, Hewson R. A susceptible mouse model for Zika virus infection. PLoS Negl Trop Dis. 2016;10(5), e0004658.View ArticlePubMedPubMed CentralGoogle Scholar
- Lazear HM, Govero J, Smith AM, Platt DJ, Fernandez E, Miner JJ, Diamond MS. A mouse model of Zika virus pathogenesis. Cell Host Microbe. 2016;19(5):720–30.View ArticlePubMedGoogle Scholar
- Yazigi A, Eldin De Pecoulas A, Vauloup-Fellous C, Grangeot-Keros L, Ayoubi JM, Picone O. Fetal and neonatal abnormalities due to congenital rubella syndrome: a review of literature. J Matern Fetal Neonatal Med. 2016 [Epub ahead of print].Google Scholar
- Feldman DM, Keller R, Borgida AF. Toxoplasmosis, parvovirus, and cytomegalovirus in pregnancy. Clin Lab Med. 2016;36(2):407–19.View ArticlePubMedGoogle Scholar
- Samarasekera U, Triunfol M. Concern over Zika virus grips the world. Lancet. 2016;387(10018):521–4.View ArticlePubMedGoogle Scholar
- Messina JP, Kraemer MUG, Brady OJ, Pigott DM, Shearer F, Weiss DJ, Golding N, Ruktanonchai CW, Gething PW, Cohn E, et al. Mapping global environmental suitability for Zika virus. eLife. 2016;5, e15272.View ArticlePubMedPubMed CentralGoogle Scholar
- Basarab M, Bowman C, Aarons EJ, Cropley I. Zika virus. BMJ. 2016;352:i1049.View ArticlePubMedGoogle Scholar
- Karwowski MP, Nelson JM, Staples JE, Fischer M, Fleming-Dutra KE, Villanueva J, Powers AM, Mead P, Honein MA, Moore CA, et al. Zika virus disease: a CDC update for pediatric health care providers. Pediatrics. 2016;137(5). doi: 10.1542/peds.2016-0621. [Epub ahead of print].
- Woods CG, Parker A. Investigating microcephaly. Arch Dis Child. 2013;98(9):707–13.View ArticlePubMedGoogle Scholar
- Marcdante K, Kliegman RM. Nelson Essentials of Pediatrics. 7th ed. Philadelphia: Elsevier; 2014.Google Scholar
- Chan JF, Choi GK, Yip CC, Cheng VC, Yuen KY. Zika fever and congenital Zika syndrome: an unexpected emerging arboviral disease. J Infect. 2016;72(5):507–24.View ArticlePubMedGoogle Scholar
- Petersen E, Wilson ME, Touch S, McCloskey B, Mwaba P, Bates M, Dar O, Mattes F, Kidd M, Ippolito G, et al. Rapid spread of Zika virus in the Americas - implications for public health preparedness for mass gatherings at the 2016 Brazil Olympic Games. Int J Infect Dis. 2016;44:11–5.View ArticlePubMedGoogle Scholar
- World Health Organization, The World Bank. World report on disability. Geneva: WHO; 2011.Google Scholar
- Xu K, Evans DB, Kawabata K, Zeramdini R, Klavus J, Murray CJL. Household catastrophic health expenditure: a multicountry analysis. Lancet. 2003;362(9378):111–7.View ArticlePubMedGoogle Scholar
- The potential economic impact of Zika virus [http://www.jhsph.edu/research/centers-and-institutes/ivac/IVACBlog/the-potential-economic-impact-of-the-zika-virus]. Accessed 8 Jan 2016.
- Watts J. Brazil's health system woes worsen in economic crisis. Lancet. 2016;387:1603–4.View ArticlePubMedGoogle Scholar
- Shepard DS, Undurraga EA, Halasa YA, Stanaway JD. The global economic burden of dengue: a systematic analysis. Lancet Infect Dis. 2016. S1473-3099(16)00146-8. doi:10.1016/S1473-3099(16)00146-8. [Epub ahead of print].
- Roth A, Mercier A, Lepers C, Hoy D, Duituturaga S, Benyon E, Guillaumot L, Souares Y. Concurrent outbreaks of dengue, chikungunya and Zika virus infections - an unprecedented epidemic wave of mosquito-borne viruses in the Pacific 2012–2014. Euro Surveill. 2014;19(41).Google Scholar
- Sirohi D, Chen Z, Sun L, Klose T, Pierson TC, Rossmann MG, Kuhn RJ. The 3.8 A resolution cryo-EM structure of Zika virus. Science. 2016;352(6284):467–70.View ArticlePubMedPubMed CentralGoogle Scholar
- Zhang Y, Corver J, Chipman PR, Zhang W, Pletnev SV, Sedlak D, Baker TS, Strauss JH, Kuhn RJ, Rossmann MG. Structures of immature flavivirus particles. EMBO J. 2003;22(11):2604–13.View ArticlePubMedPubMed CentralGoogle Scholar
- Zhang W, Kaufmann B, Chipman PR, Kuhn RJ, Rossmann MG. Membrane curvature in flaviviruses. J Struct Biol. 2013;183(1):86–94.View ArticlePubMedPubMed CentralGoogle Scholar
- Kuhn RJ, Zhang W, Rossmann MG, Pletnev SV, Corver J, Lenches E, Jones CT, Mukhopadhyay S, Chipman PR, Strauss EG, et al. Structure of dengue virus: implications for flavivirus organization, maturation, and fusion. Cell. 2002;108(5):717–25.View ArticlePubMedPubMed CentralGoogle Scholar
- Beasley DW, Whiteman MC, Zhang S, Huang CY, Schneider BS, Smith DR, Gromowski GD, Higgs S, Kinney RM, Barrett AD. Envelope protein glycosylation status influences mouse neuroinvasion phenotype of genetic lineage 1 West Nile virus strains. J Virol. 2005;79(13):8339–47.View ArticlePubMedPubMed CentralGoogle Scholar
- Larocca RA, Abbink P, Peron JP, Zanotto PM, Iampietro MJ, Badamchi-Zadeh A, Boyd M, Ng'ang'a D, Kirilova M, Nityanandam R, et al. Vaccine protection against Zika virus from Brazil. Nature. 2016. doi:10.1038/nature18952 [Epub ahead of print].PubMedGoogle Scholar
- Cugola FR, Fernandes IR, Russo FB, Freitas BC, Dias JLM, Guimarães KP, Benazzato C, Almeida N, Pignatari GC, Romero S, et al. The Brazilian Zika virus strain causes birth defects in experimental models. Nature. 2016;534(7606):267–71.PubMedPubMed CentralGoogle Scholar
- Waggoner JJ, Pinsky BA. Zika virus: diagnostics for an emerging pandemic threat. J Clin Microbiol. 2016;54(4):860–7.View ArticlePubMedPubMed CentralGoogle Scholar
- Zumla A, Goodfellow I, Kasolo F, Ntoumi F, Buchy P, Bates M, Azhar EI, Cotten M, Petersen E. Zika virus outbreak and the case for building effective and sustainable rapid diagnostics laboratory capacity globally. Int J Infect Dis. 2016;45:92–4.View ArticlePubMedGoogle Scholar
- Petersen EE, Polen KN, Meaney-Delman D, Ellington SR, Oduyebo T, Cohn A, Oster AM, Russell K, Kawwass JF, Karwowski MP, et al. Update: Interim guidance for health care providers caring for women of reproductive age with possible Zika virus exposure - United States, 2016. MMWR Morb Mortal Wkly Rep. 2016;65(12):315–22.View ArticlePubMedGoogle Scholar
- Lanciotti RS, Kosoy OL, Laven JJ, Velez JO, Lambert AJ, Johnson AJ, Stanfield SM, Duffy MR. Genetic and serologic properties of Zika virus associated with an epidemic, Yap State, Micronesia, 2007. Emerg Infect Dis. 2008;14(8):1232–9.View ArticlePubMedPubMed CentralGoogle Scholar
- Monath TP, Craven RB, Muth DJ, Trautt CJ, Calisher CH, Fitzgerald SA. Limitations of the complement-fixation test for distinguishing naturally acquired from vaccine-induced yellow fever infection in flavivirus-hyperendemic areas. Am J Trop Med Hyg. 1980;29(4):624–34.PubMedGoogle Scholar
- Pyke AT, Daly MT, Cameron JN, Moore PR, Taylor CT, Hewitson GR, Humphreys JL, Gair R. Imported zika virus infection from the cook islands into Australia, 2014. PLoS Curr. 2014;6. doi:10.1371/currents.outbreaks.4635a54dbffba2156fb2fd76dc49f65e.
- Aubry M, Richard V, Green J, Broult J, Musso D. Inactivation of Zika virus in plasma with amotosalen and ultraviolet A illumination. Transfusion. 2016;56(1):33–40.View ArticlePubMedGoogle Scholar
- Faye O, Faye O, Diallo D, Diallo M, Weidmann M, Sall AA. Quantitative real-time PCR detection of Zika virus and evaluation with field-caught mosquitoes. Virol J. 2013;10:311.View ArticlePubMedPubMed CentralGoogle Scholar
- Faye O, Faye O, Dupressoir A, Weidmann M, Ndiaye M, Alpha SA. One-step RT-PCR for detection of Zika virus. J Clin Virol. 2008;43(1):96–101.View ArticlePubMedGoogle Scholar
- Balm MN, Lee CK, Lee HK, Chiu L, Koay ES, Tang JW. A diagnostic polymerase chain reaction assay for Zika virus. J Med Virol. 2012;84(9):1501–5.View ArticlePubMedGoogle Scholar
- Musso D, Gubler DJ. Zika virus. Clin Microbiol Rev. 2016;29(3):487–524.View ArticlePubMedGoogle Scholar
- Calvet G, Aguiar RS, Melo AS, Sampaio SA, de Filippis I, Fabri A, Araujo ES, de Sequeira PC, de Mendonca MC, de Oliveira L, et al. Detection and sequencing of Zika virus from amniotic fluid of fetuses with microcephaly in Brazil: a case study. Lancet Infect Dis. 2016;16(6):653–60.View ArticlePubMedGoogle Scholar
- Besnard M, Lastere S, Teissier A, Cao-Lormeau V, Musso D. Evidence of perinatal transmission of Zika virus, French Polynesia, December 2013 and February 2014. Euro Surveill. 2014;19(13).Google Scholar
- Dupont-Rouzeyrol M, Biron A, O'Connor O, Huguon E, Descloux E. Infectious Zika viral particles in breastmilk. Lancet. 2016;387(10023):1051.View ArticlePubMedGoogle Scholar
- D'Ortenzio E, Matheron S, de Lamballerie X, Hubert B, Piorkowski G, Maquart M, Descamps D, Damond F, Yazdanpanah Y, Leparc-Goffart I. Evidence of sexual transmission of Zika virus. N Engl J Med. 2016;374(22):2195–8.View ArticlePubMedGoogle Scholar
- Musso D, Roche C, Nhan TX, Robin E, Teissier A, Cao-Lormeau VM. Detection of Zika virus in saliva. J Clin Virol. 2015;68:53–5.View ArticlePubMedGoogle Scholar
- Gourinat AC, O'Connor O, Calvez E, Goarant C, Dupont-Rouzeyrol M. Detection of Zika virus in urine. Emerg Infect Dis. 2015;21(1):84–6.View ArticlePubMedPubMed CentralGoogle Scholar
- Kutsuna S, Kato Y, Takasaki T, Moi M, Kotaki A, Uemura H, Matono T, Fujiya Y, Mawatari M, Takeshita N, et al. Two cases of Zika fever imported from French Polynesia to Japan, December 2013 to January 2014 [corrected]. Euro Surveill. 2014;19(4).Google Scholar
- Alcantara D, O'Driscoll M. Congenital microcephaly. Am J Med Genet C Semin Med Genet. 2014;166C(2):124–39.View ArticlePubMedGoogle Scholar
- Faheem M, Naseer MI, Rasool M, Chaudhary AG, Kumosani TA, Ilyas AM, Pushparaj PN, Ahmed F, Algahtani HA, Al-Qahtani MH, et al. Molecular genetics of human primary microcephaly: an overview. BMC Medical Genomics. 2015;8(1):1–11.View ArticleGoogle Scholar
- Feldman HS, Jones KL, Lindsay S, Slymen D, Klonoff-Cohen H, Kao K, Rao S, Chambers C. Prenatal alcohol exposure patterns and alcohol-related birth defects and growth deficiencies: a prospective study. Alcohol Clin Exp Res. 2012;36(4):670–6.View ArticlePubMedGoogle Scholar
- Martines RB, Bhatnagar J, Keating MK, Silva-Flannery L, Muehlenbachs A, Gary J, Goldsmith C, Hale G, Ritter J, Rollin D, et al. Notes from the field: evidence of Zika virus infection in brain and placental tissues from two congenitally infected newborns and two fetal losses - Brazil, 2015. MMWR Morb Mortal Wkly Rep. 2016;65(6):159–60.View ArticlePubMedGoogle Scholar
- Hamel R, Dejarnac O, Wichit S, Ekchariyawat P, Neyret A, Luplertlop N, Perera-Lecoin M, Surasombatpattana P, Talignani L, Thomas F, et al. Biology of Zika virus infection in human skin cells. J Virol. 2015;89(17):8880–96.View ArticlePubMedPubMed CentralGoogle Scholar
- Nowakowski TJ, Pollen AA, Di Lullo E, Sandoval-Espinosa C, Bershteyn M, Kriegstein AR. Expression analysis highlights AXL as a candidate Zika virus entry receptor in neural stem cells. Cell Stem Cell. 2016;18(5):591–6.View ArticlePubMedGoogle Scholar
- McCarthy M. Severe eye damage in infants with microcephaly is presumed to be due to Zika virus. BMJ. 2016;352:i855.View ArticlePubMedGoogle Scholar
- Adibi JJ, Marques Jr ET, Cartus A, Beigi RH. Teratogenic effects of the Zika virus and the role of the placenta. Lancet. 2016;387(10027):1587–90.View ArticlePubMedGoogle Scholar
- Bayer A, Lennemann NJ, Ouyang Y, Bramley JC, Morosky S, Marques Jr ET, Cherry S, Sadovsky Y, Coyne CB. Type III interferons produced by human placental trophoblasts confer protection against Zika virus infection. Cell Host Microbe. 2016;19(5):705–12.View ArticlePubMedGoogle Scholar
- Quicke KM, Bowen JR, Johnson EL, McDonald CE, Ma H, O’Neal JT, Rajakumar A, Wrammert J, Rimawi BH, Pulendran B, et al. Zika virus infects human placental macrophages. Cell Host Microbe. 2016;20:1–8.View ArticleGoogle Scholar
- D’Ortenzio E, Matheron S, de Lamballerie X, Hubert B, Piorkowski G, Maquart M, Descamps D, Damond F, Yazdanpanah Y, Leparc-Goffart I. Evidence of sexual transmission of Zika virus. New Engl J Med. 2016;374(22):2195–8.View ArticlePubMedGoogle Scholar
- Delorme-Axford E, Bayer A, Sadovsky Y, Coyne CB. Autophagy as a mechanism of antiviral defense at the maternal-fetal interface. Autophagy. 2013;9(12):2173–4.View ArticlePubMedGoogle Scholar