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  1. Hace 1 día · The different sites of infection (shown in red) of seasonal H1N1 versus avian H5N1 influences their lethality and ability to spread. [21] In general, humans who catch a humanized influenza A virus (a human flu virus of type A) usually have symptoms that include fever , cough , sore throat , muscle aches , conjunctivitis , and, in severe cases, breathing problems and pneumonia that may be fatal ...