Perhaps, flu virus {influenza}| {flu} came from pigs, ducks, or chickens. RNA virus has eight segments, which can mutate or recombine {reassortment}.
proteins
Flu virus has surface proteins. One protein {hemagglutinin} binds to mammal or bird cell-surface sialic acid to attach virus to cells and allow entry. One protein {neuraminidase} removes sialic acid from newly formed virus surfaces to allow viruses to leave host cells and go to other cells.
proteins: coat
Some genes, such as pore-making viral-coat-protein external part M2e, do not change and might be good for vaccines.
names
Flu-virus names indicate hemagglutinin H and neuraminidase N strains, for example H5N1. These two genes have frequent point mutations that cause genetic drift. Influenza virus can use genes from different animals, resulting in genetic shift.
Birds can have deadly flu [1998] {avian flu} {bird flu} {H5N1 influenza}.
4-Medicine-Disease-Kinds-Organism-Virus
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Date Modified: 2022.0225