name the microorganism that causes influenza
Answers
Influenza viruses belong to the family Orthomyxoviridiae, which is characterized by a single-stranded and segmented RNA genome. The influenza viruses are classified into types A, B and C on the basis of their core proteins, whereas the subtypes of influenza A viruses are determined by envelope glycoproteins possessing either haemagglutinin (HA) or neuraminidase (NA) activity. High mutation rates and frequent genetic reassortments of these viruses contribute to great variability of the HA and NA antigens. Minor point mutations causing small changes ("antigenic drift") occur relatively often.
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Explanation:
The influenza viruses are classified into types A, B and C on the basis of their ... Only types A and B cause human disease of any concern.