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Llana [10]
4 years ago
7

In 2009, h1n1 flu caused many cases of flu around the world. Research how h1n1 flu differs from the 1918-1919 flu.

Biology
1 answer:
RUDIKE [14]4 years ago
3 0
Flu (influenza) viruses are divided into four broad categories: influenza A, B, C or D. Influenza A is the most common type. H1N1 flu is a subtype of influenza A.

Subtypes of influenza A are categorized based on two proteins on the surface of the virus, hemagglutinin (H) and neuraminidase (N). There are many H and N subtypes, and each one is numbered. All H and N flu subtypes are influenza A viruses.

Each influenza subtype has many different strains of influenza virus. Not all strains infect people. Subtypes of influenza A viruses currently found in people are strains of H1N1 and H3N2. Each year's flu vaccine includes varieties of both of these strains and influenza B.

i hope this helps. please mark brainliest if it does :)
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