His first detection of malarial parasite from patients came only after two months of hard work.[40] The disappointed Ross had to be encouraged by Manson calling the study as the "Holy Grail" of malaria research, and that Ross was the "Sir Galahad".[4] After one and half years he made no significant progress. On 20 August 1897 he made a momentous discovery that some mosquitoes had malarial parasites in them. He had fed the blood of a malarial patient (Husein Khan) to different groups of mosquitoes four days before, and found that only one type (which he called "brown type" or more commonly "dappled-winged mosquitoes", not knowing the species, which in fact was Anopheles) acquired the malarial parasites in its stomach.[41][42] This was the first evidence for Manson's theory that mosquito did carry the malarial parasite, and Ross would later famously call 20 August as "Malaria Day" (now adopted as World Mosquito Day).[43][44][45][46]