<prompt> Incubation period of HiN, influenza ?3 days2 weeks3 weeks4 weeks  <response>: Ans. is a i.e., 3 days The incubation period of pandemic influenza A H1N1 is 2-3 days, but could range upto 7 days 1 week. On 26th september 2011 WHO has adapted a new nomenclature as Influenza A HINI pdm 09. Case difinitions : ? Suspected case : - A person with acute febrile respiratory illness fever 38degC with onset : 1 Within 7 days of close contact to confirmed case of influenza A F11111 2009; or within 7 days of travel to areas where there are confirmed cases; or 3 Resides in a community where there are confirmed cases. Probable case : - A person with acute febrile respiratory illness who : 1 is positive for influenza A, but unsubtypable for H1 and H3 by influenza -PCR or reagents used to detect seasonal influenza virus infection; or 2 is positive for influenza A by influenza rapid test or IFA and meets criteria for suspected case; or 3 who died of an enexplained acute respiratory illness who is considered to be epidemiologically linked to a probable or confirmed case. Confirmed case : - A person with acute febrile respiratory illness with laboratory confirmed influenza A H1N1 2009 by one or more of following : i Real time PCR; ii viral culture; iii four-fold rise in virus specific neutrilizing antibodies. 