Worm Intensity
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ProgramEggs per gramPrevalence rate
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Program WeightAscarisWhipwormHookwormSchistosomiasis mansoniSchistosomiasis haematobium (eggs/10mL)AscarisWhipwormHookwormSchistosomiasis mansoniSchistosomiasis haematobiumAny infectionAny STHSources
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Miguel and Kremer 2004
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Group 1 schools — 1998 pre-treatment23371614269142%55%77%22%92%89%Miguel and Kremer 2004, Pg 168, Table 2.
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SCISource Key
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Ethiopia18%1858109010%4%5%4%0%Ethiopia, Impact Survey – Baseline 2015/16, p. 6-8
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Malawi13%000240%0%0%2%10%0%Malawi 2nd Follow-Up Survey report, p. 11
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Mozambique13%2791296%4%11%3%26%SCI 2016 report to DFID, p. 10 & Fiona Fleming, emails to GiveWell, November 2 2016 and November 7 2016
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DRC11%125996259532%3%25%Democratic Republic of Congo Baseline Impact Survey 2015, p. 4 & SCI 2016 report to DFID, p. 9
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Madagascar4%1161214623%1%1%5%31%Madagascar Baseline Impact Survey 2015, p. 6
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Tanzania6%00462920%0%10%2%10%SCI 2016 report to DFID, p. 10 & Fiona Fleming, email to GiveWell, November 2, 2016
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Cote d'Ivoire5%10815443462%1%13%16%10%Fiona Fleming, email to GiveWell, November 7, 2016
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Zambia2%8314286143%0%11%2%10%Zambia ICOSA Baseline Report, p. 11
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Uganda4%1012431%3%15%6%0%Unpublished studies shared with GiveWell
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Liberia1%405164213%1%15%26%20%SCI report to DFID (October 2013), Annex 1, p. 26
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Weighted average — SCI237181316115%2%7%8%10%
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Deworm the World
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Bihar38%14776133052%5%42%0%68%68%DtWl Bihar 2011 Prevalence Survey Report, p. 4
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Rajasthan18%31101020%0%1%0%21%21%DtWI Rajasthan 2013 Prevalence Survey Report, p. 6
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Madhya Pradesh14%00600%0%12%0%12%12%DtWI Madhya Pradesh 2015 Program Report, p. 37
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Kenya19%165333641218%7%16%2%Mwandawiro et al. 2013
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Uttar Pradesh6%6889317070%5%23%0%76%76%DtWI Uttar Pradesh Prevalence Survey Report, p. 20
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Delhi3%9031012%6%1%0%16%16%DtWI Delhi 2012 Prevalence Survey Report, p. 3
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Chhattisgarh3%710206070%0%11%0%75%75%DtWI Chhattisgarh Prevalence Survey Report, p. 17
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Weighted average — Deworm the World1554965233%4%23%0%48%47%
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Sightsavers
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Nigeria88%21%19%Sightsavers prevalence and intensity summary workbook
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DRC6%47%9%Sightsavers prevalence and intensity summary workbook
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Guinea-Bissau 6%4%64%Sightsavers prevalence and intensity summary workbook
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Weighted average — Sightsavers21%20%
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Worm burden compared to Miguel and Kremer 2004
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SCI10%11%3%18%11%4%9%38%
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Deworm the World66%6%15%3%80%7%29%2%52%53%
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Sightsavers97%23%
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Intensity normalized to moderate intensity threshold
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Moderate Intensity threshold (EPG)5000400750250Miguel and Kremer 2004, Pg 168, Table 2.
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Miguel and Kremer47%40%57%36%
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SCI5%5%2%7%
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Deworm the World31%2%9%1%
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Sightsavers
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Quadratic polynomial parameters (Lo et al. 2016)
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P1139106712491156
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P24432-49-656219
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P375579635
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Values marked in yellow are intensity estimates calculated based on the model presented in Lo et al. 2016. The model allows estimation of worm intensity in terms of eggs per gram when only prevalence information is available.
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Lo et al. 2016
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Lo et al. 2016—Supplementary Appendix
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