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.
Biological Sciences>Medicine>Disease>Kinds>Organism>Virus>Flu
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Date Modified: 2022.0224