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Table 2 Community prevalences of asexual P. falciparum parasitaemia by microscopy or RDT; 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
Tested Positive Positivity rates (95% CI) Tested Positive Positivity rates (95% CI)
2003 1189 172 14.5% (12.5–16.6) 2167 174 8.0% (6.9–9.3)
2005 1241 135 10.9% (9.2–2.7) 1503 48 3.2% (2.4–4.2)
2006 1182 56 4.7% (3.6–6.1) 1433 12 0.8% (0.4–1.5)
2007 1575 15 1.0% (0.5–1.6) 1499 0 0.0% (0.0–0.2)
2008 2091 10 0.5% (0.2–0.9) 1746 4 0.2% (0.1–0.6)
2009 1539 0 0.0% (0–0.2) 1163 0 0.0% (0.0–0.3)
2011* 1271 10 0.8% (0.4–1.4) 1561 2 0.1% (0.0–0.5)
2013* 1579 7 0.4% (0.2–0.9) 1447 3 0.2% (0.0–0.6)
2015* 1515 9 0.6% (0.3–1.1) 1497 4 0.3% (0.1–0.7)
  1. *Malaria diagnosis by RDT instead of blood slide microscopy