They are more closely related to each other than to influenza virus a iva or influenza virus b ivb, containing seven genomic segments and a hemagglutininesterase he. Sialic acids 9oacetylneraminic acid hostvirus interaction ecology and disease geography worldwide, more common in winter associated diseases acute febrile. Influenza is a highly contagious acute viral infection of the res piratory tract. Infec tion occurs at all ages, but during epidemics the morbidity is higher at extremes of life. Rna1 rna2 rna3 rna4 rna5 rna6 rna7 genome proteome host host human cell tropism epithelial respiratory cells interactions cell receptors. Collaborating centre for influenza at cdc atlanta, united states of america, has made available the protocol, attached, of realtime rtpcr for influenza ah1n1. Influenza a viruses are divided into subtypes based on two proteins on the surface of the virus. Pdf influenza is a highly contagious acute viral infection of the respiratory tract. Influenza type c infections generally cause mild illness and are not thought to cause human flu epidemics. Virus influenza e o organismo humano influenza virus. Cdc protocol of realtime rtpcr for influenza ah1n1 28 april 2009. This work is licensed under a creative commons attribution. Reference strain influenza c virus c ann arbor150 sequence. Influenza a virus is a highly mutable virus with frequent antigenic drift and occasional antigenic shift.
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