Attributed to rhazes (900 ad) associated with a persian scientist and he believed smallpox and measles came from the same cause. Aka = rubeola, hard, measles, red measles, morbilli, hasbah. Prevailing theory = red rash represented the mother"s menstrual blood accumulated during pregnancy and when the person gets rid of the measles it was thought they got rid of the poison . Origins of term measles = misellus" or misella" i. e. miserable. 1670- thomas sydenham"s, he was the first to clinically distinguish between smallpox and measles; did all this through his son"s attack. Around this time they rejected the mother"s blood theory. 1757 francis homes demonstrated the infective nature by transmitting infected blood from a child and injected into other uninfected child. Encephalitis complication of the brain results from measles, herpes virus, chickenpox etc. A scientist sent by the danish government to investigate the epidemic in faeroe isles. Geographically this place is ideal for epidemiology (roughly between iceland and.