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Table 5 Baseline, midterm and endline schistosomiasis prevalence (%) and relative reduction (RR) by county among Kenyan school-aged children, 2012–2017

From: Results of a national school-based deworming programme on soil-transmitted helminths infections and schistosomiasis in Kenya: 2012–2017

  S. mansoni S. haematobium
County Y1 baseline Y3 midterm Y5 endline RR (%) Y1 baseline Y3 midterm Y5 endline RR (%)
Overall 2.1 1.5 1.7 19.3 14.8 6.8 2.4 84.0*
Bomet 0 0.2 0.3 +
Bungoma 0 0.1 0.1 +
Busia 12.6 12.1 8.0 36.4*
Homa Bay 5.8 1.7 3.7 37.4*
Kakamega 0.1 0.3 1.0 +
Kericho 0 0.2 0 0
Kilifi 0 0 0.1 + 10.0 12.6 1.5 85.0*
Kisii 0.2 0 0.3 +
Kisumu 3.1 1.0 5.4 +
Kwale 0.1 0.1 0 100 17.5 8.4 5.3 69.7*
Migori 0 0.3 0.4 +
Mombasa 0 0.1 0.3 + 0 0 0 0
Narok 1.2 1.0 1.3 +
Nyamira 0.4 0 0.1 74.4
Taita Taveta 0 0 0 0 0 0 0 0
Vihiga 0 0.1 0.4 +
  1. *Statistically significant (P < 0.05) relative reduction in prevalence
  2. + indicates an increase rather than relative reduction in prevalence
  3. – indicates areas where survey for S. haematobium was not undertaken