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Table 3 Community parasite prevalences (P. falciparum and P. malariae) by PCR; all age groups in May/June

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

Year Micheweni district North A district
Samples tested Positive Positivity rate (95% CI) Samples tested Positive Positivity rate (95% CI)
2005 190 53 27.9% (21.7–34.9) 288 47 16.3% (12.2–21.1)
2009 1410 72 5.1% (4.0–6.4) 1013 9 0.9% (0.4–1.7)
2011 1378 45 3.3% (2.4–4.4) 1599 22 1.4% (0.9–2.1)
2013 1575 42 2.7% (1.9–3.6) 1448 26 1.8% (1.2–2.6)
2015 1519 26 1.7% (1.1–2.4) 1497 28 1.9% (1.2–2.6)
  1. Linear trends in positivity rates from 2009 to 2015 were statistically significant in Micheweni district (decreasing p < 0.001) and in North A (increasing p = 0.036). These trends differed by district (interaction) (p < 0.001)