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Table 4 Malaria-related indices before interventions (2002–2003) compared to 2015; both districts combined

From: From high to low malaria transmission in Zanzibar—challenges and opportunities to achieve elimination

  2002/3 2015 Reduction % (X-fold)
Fever patients in health care facilities
 Parasite prevalence by microscopy/RDT 38.2% (95% CI 37.5–39.0) 2.2%, (95% CI 2.0–2.3) 94.2% (17)
Community-based cross-sectional surveys
 Parasite prevalence by microscopy/RDT 10.3% (95% CI 9.3–11.4) 0.43% (95% 0.23–0.73) 95.8% (24)
 Parasite prevalence by PCR 24.8% (95% CI 23.4–26.3) 1.8% (95% CI 1.3–2.3) 92.7% (14)
Parasite densities
 Among microscopy positive or ≥ 50 par/μl—geometrical mean par/μl 1135 (Range 115–149,000) 161(Range 53–770) 85.8% (7)
 Among all—arithmetical mean par/μl 450* 0.34 99.9% (1324)
 Seroconversion rate per year 11% (95% CI 8–13) 0.8% (95% CI 0.6–1.1) 92.1% (14)
 Crude under 5 child mortality per year** 1.01% (95% CI 0.84–1.19) 0.36% (95% CI 0.28–0.48) 64.4% (2.8)
 Human biting rate per person night*** 12.44* 0.27 97.8% (46)
 Entomological inoculation rate (infective bites/year)*** 136* 0.05 > 99.9% (2720)
  1. *In 2005 before intensified vector control
  2. **North A only
  3. ***Mean of indoors and outdoors