Wow! I have looked into this since it hit the news,because it sounded a lot like the drug we had to take in Vietnam to prevent us from getting malaria. Back then (1966-67) we took one large pink pill every Tuesday morning. It was called Chloraprimaquinine or something close to that. As far as I know we only had one soldier get sick with malaria. Every Tuesday we had to sign a sheet and take the pill in front of a medic. The only side effect I remember was that for the first week or two it would cause some soldiers to get diarrhea for a day or so. I really believe that this drug protected us from Malaria because some mornings out in the bush I would wake up with hundreds of mosquito bites on exposed areas. I really hope this works for this virus. I know malaria is caused by a parasite but maybe it works for this virus too.