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NameNamePerson-to-person influenza virusAvian flu virusNew influenza virusBird flu virus is present in the intestines of wild waterfowl.(1) Infection occurs by contact between birds and through feces and other means.(2) In rare cases, human beings are infected by contact.(2) In rare cases, human beings are infected by contact.(3) 2 types of virus reaggregate to form a new strain of virus that is highly infectious from person to person.(3) Virus mutates and becomes a new strain of virus that is highly infectious from person to person.(4) The appearance of a new strain of virus results in the risk of explosive infection.New Influenza (A/H1N1) Projected damage in case of new influenza epidemicPast Influenza PandemicsSymptoms　New influenza viruses are thought to basically have similar initial symptoms, i.e. high fever, coughing, etc., as other forms of influenza. However, highly pathogenic strains of new influenza originating out of avian influenza (A/H5N1, A/H7N9) are more likely to cause fatalities, and there is concern over the mass health impact such strains could impart.531. New Influenza Virus　New Influenza Virus　A new type of influenza Virus is that has never been infected by humans in the past. The H1N1 strain of influenza (A/H1N1) that occurred in April 2009 was fortunately not very pathogenic, but shifted to a seasonal influenza at the end of March 2011.　However, overseas infections affecting humans such as avian influenza (A/H5N1、A/H7N9) have been confirmed, and there are concerns that such viruses may mutate into a novel influenza.　Since many humans do not have immunity to the H1N1 influenza, there are concerns that a pandemic could occur around the world, resulting in extensive harm to human life as well as to social and economic activities.Section 3 Other Crisis Management