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Table 3 Results of phase 1B surveys and assessment if epidemiological criteria for stopping treatment are met

From: Progress towards onchocerciasis elimination in the participating countries of the African Programme for Onchocerciasis Control: epidemiological evaluation results

Country Evaluation area Pre-control endemicity (maximum nodule prevalence)    Results of Phase 1B surveys Results of all surveys combined
Phase 1B Evaluation year No. of treatment rounds with >60 % coverage No. of villages evaluated Number examined for mf mf positives No. of villages evaluated Number examined for mf mf positives Probability that true prevalence of mf in evaluation area exceeds 1.4 % Probability that true maximum stratum prevalence of mf exceeds 5 % Epidemiological criteria for stopping treatment meta
Number % Maximum % per village Number % Mean % per village Maximum % per village
Burundi Bururi 31.0 2013 7 20 8,621 2 0.02 0.7 20 8,621 2 0.02 0.03 0.7 0.000 0.000 Yes
  Cibitoke Bubanza 49.1 2013 7 10 3,886 1 0.03 0.3 20 7,310 1 0.01 0.01 0.3 0.000 0.000 Yes
  Rutana 24.6 2013 7 20 7,505 0 0.00 0.0 20 7,505 0 0.00 0.00 0.0 0.000 0.001 Yes
Chad Logon Occidental 37.9 2014 13 9 2,360 0 0.00 0.0 19 5,680 0 0.00 0.00 0.0 0.000 0.000 Yes
  Logon Oriental 62.8 2014 13 43 9,624 33 0.34 11.9 62 14,027 38 0.27 0.36 11.9 0.000 1.000 Close
Mandoul 66.1 2013 12 32 12,812 28 0.22 3.4 32 12,812 28 0.22 0.26 3.4 0.000 0.205 Close
Mayo Kebbi East 45.2 2014 13 25 7,648 0 0.00 0.0 30 9,308 0 0.00 0.00 0.0 0.000 0.006 Yes
Mayo Kebbi West 44.4 2014 13 16 6,660 0 0.00 0.0 34 13,085 1 0.01 0.01 0.0 0.000 0.000 Yes
Moyen-Chari 40.1 2012 11 20 5,736 0 0.00 0.0 29 7,073 0 0.00 0.00 0.0 0.000 0.017 Yes
Tandjile 38.7 2013 12 29 8,414 3 0.04 0.7 29 8,414 3 0.04 0.03 0.7 0.000 0.008 Yes
Ethiopia North Gondar 47.4 2013 9 20 2,986 0 0.00 0.0 30 4,913 0 0.00 0.00 0.0 0.000 0.009 Yes
Malawi Malawi Extension 21.6 2012 8 12 2,220 29 1.31 8.7 21 4,180 29 0.69 0.46 8.7 0.012 0.997 Close
  Thyolo Muanza 34.1 2012 8 12 2,105 13 0.62 8.2 23 4,480 13 0.29 0.36 8.2 0.004 0.970 Close
Nigeria Cross River 56.1 2012 14 22 3,832 275 7.18 25.3 42 7,415 356 4.80 5.10 25.3 1.000 1.000 No
  Ebonyi 60.2 2012 13 7 1,465 45 3.07 11.9 18 3,441 45 1.31 1.06 11.9 0.859 1.000 Close
  Enugu Anambra 63.0 2012 12 14 2,595 49 1.89 12.0 25 4,991 135 2.70 2.29 13.7 1.000 1.000 No
  Kaduna 55.8 2012 21 17 2,600 0 0.00 0.0 46 8,588 0 0.00 0.00 0.0 0.000 0.033 Yes
Tanzania Tanga 35.4 2012 11 20 3,596 1 0.03 0.5 30 5,643 7 0.12 0.11 1.1 0.000 0.028 Yes
  Tukuyu 39.7 2012 11 17 3,146 0 0.00 0.0 28 5,007 0 0.00 0.00 0.0 0.000 0.042 Yes
  Tunduru 67.5 2013 16 10 1,379 0 0.00 0.0 20 3,211 0 0.00 0.00 0.0 0.000 0.020 Yes
Uganda Adjumani Mojo 45.5 2012 13 19 4,465 63 1.41 9.7 28 5,645 98 1.74 1.76 9.7 1.000 1.000 No
  Kasese 87.3 2012 14 18 4,981 23 0.46 3.5 28 6,491 74 1.14 1.45 12.1 0.999 1.000 Close
Total      392 108,636 565 0.52 25.3 614 157,840 830 0.53 0.52 25.3    
  1. aCriteria met:
  2. Yes: Probability <0.01 that the area prevalence exceeds 1.4 % and probability <0.05 that the maximum sample stratum prevalence exceeds 5 %
  3. Close: Above probability thresholds not met but percentage mf positives <1.4 %
  4. No: Above probability thresholds not met and percentage mf positives >1.4 %