# GiveWell donors supported more than direct delivery: AMF and new net research

Supporters of the Against Malaria Foundation in recent years may have had even more impact than they expected.

## Conclusion

AMF shared preliminary findings from the Uganda study in November.[20] They’re promising. AMF reported that PBO nets were more effective at reducing malaria cases than standard nets six months after distribution (26% more), 12 months after distribution (27% more), and 18 months after distribution (16% more).[21] There will be one more measurement completed as part of this study.[22]

The full results from the Uganda RCT have not been published. We will review them closely and share our conclusions once they are available.

Our current best guess is that in many of the locations where AMF works, PBO nets are more cost-effective than standard nets. We estimate that in areas with sufficiently high insecticide resistance, the benefits of PBO nets outweigh the higher cost of these nets. We expect to revise our estimate of the cost-effectiveness of PBO nets once we have fully reviewed the results from the Uganda RCT. We look forward to seeing how the research community interprets these results and whether they conclude that PBO nets are a worthwhile investment. A possible sign of increased demand for PBO nets is that one manufacturer of PBO nets increased its production by a large amount in 2020, according to AMF.[23]

AMF’s work on PBO nets is one example of how our top charities can have more impact than expected. We’re thrilled to recommend our top charities based on the great work they do: not only on direct delivery of cost-effective programs, but also on new research to shape their fields of work.