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Influenza A virus subtype H2N2 (A/H2N2) is a subtype of Influenza A virus. H2N2 has mutated into various strains including the " Asian flu " strain (now extinct in the wild), H3N2 , and various strains found in birds .
The 1957–1958 Asian flu pandemic was a global pandemic of influenza A virus subtype H2N2 that originated in Guizhou in Southern China. [3] [4] [1] The number of excess deaths caused by the pandemic is estimated to be 1–4 million around the world (1957–1958 and probably beyond), making it one of the deadliest pandemics in history.
By the time of the 1889 pandemic, which may have been caused by an H2N2 strain, [78] the flu had become an easily recognizable disease. [75] The microbial agent responsible for influenza was incorrectly identified in 1892 by R. F. J. Pfeiffer as the bacteria species Haemophilus influenzae, which retains "influenza" in its name.
It is now known that this was caused by an immunologically novel H1N1 subtype of influenza A. [43] The next pandemic took place in 1957, the "Asian flu", which was caused by a H2N2 subtype of the virus in which the genome segments coding for HA and NA appeared to have derived from avian influenza strains by reassortment, while the remainder of ...
Antigenic shift is a specific case of reassortment or viral shift that confers a phenotypic change. Antigenic shift is contrasted with antigenic drift, which is the natural mutation over time of known strains of influenza (or other things, in a more general sense) which may lead to a loss of immunity, or in vaccine mismatch.
Google also has updated its maps. Apple did not reply to a request for comment on whether it would honor the change and had not swapped in the new name by 5 p.m. Monday.
London flu gets its name as the World Health Organization Influenza Centre's laboratories first identified it as a distinct strain in the UK in early 1972. [ 10 ] Progression within the United States
A typical La Niña pattern produces a wetter, cooler winter over the northern U.S., while drier, milder weather takes hold of the South. While there have been important caveats that go against the ...