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Does anyone have estimates on the cost effectiveness of trachoma prevention? It seems as though mass antibiotic administration is effective and cheap, and blindness is quite serious. However room for funding might be limited. I haven't seen it investigated by many of the organizations, but maybe I just haven't found the right report.
GiveWell looked at this in 2009 and decided that chemoprophylaxis is not cost effective.
GiveWell leans on a 2005 Cochrane study that concluded that "For the comparisons of oral or topical antibiotic against placebo/no treatment, the data are consistent with there being no effect of antibiotics".
However, it looks like Cochrane revisited this in 2019 and I'm not sure if Givewell took a second look.