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Item The Two Faces of Influenza(Association of Kenya Physicians, 2007) Sabine, Arnoux; Association of Kenya Physicians Scientific Conference (11th : Mar. 2007 : Eldoret, Kenya)Influenza is often misunderstood and underestimated. Influenza is not just “a bad cold”. Mainly spread through the air by coughing and sneezing, especially in closed public places: public transport, meeting rooms, etc. An infected person can transmit the virus to others from 1-2 days before flu symptoms start, and for 5 days afterwards. Influenza virus mutations: Influenza type A viruses mutate frequently, type B viruses mutate less frequently. Mutation enables the virus to bypass the population’s acquired immunity. Both the haemagglutinin and neuramidase surface antigens mutate.