John there was in my mind no protection whatsover from Mosquitoes , considering they didnt have tents for most of the campaign ! , I doubt there was a spray of any sort , certainly no such thing as an aerosol ! . Considering their limited knowledge on fevers and water borne contaminates , I doubt there was any type of preventional care . Unless , of course , they picked up some sort of local remedy . Very happy to be corrected , the Sth African connection may also be able to shed some light on this matter .