Are there any solid data on malaria prevention?

I’d think that everyone who’s fighting some problem, like malaria in this case, would want to have the best available data to track their progress and effectiveness. In this case, it seems the Gates Foundation and WHO would rather cherry pick the evidence. Why do some, more than we’d like to admit, organizations resist collecting and disseminating honest performance metrics? MADE-UP MALARIA DATA ROUND 2: Gates Foundation responds, WHO graciously offers not to respond (Aid Watch)

It may seem obsessive to insist on good data, but bad data costs lives. The sad thing is that there have been SOME victories against malaria, and that solid data on WHAT is working WHERE is vital to guide the campaign against this tragic disease. Would Americans put up with the CDC using made up data to respond to a salmonella outbreak?