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Influenza A viruses are further classified, based on the viral surface proteins hemagglutinin (HA or H) and neuraminidase (NA or N). 18 HA subtypes (or serotypes) and 11 NA subtypes of influenza A virus have been isolated in nature. Among these, the HA subtype 1-16 and NA subtype 1-9 are found in wild waterfowl and shorebirds and the HA ...
Japanese women in Tokyo during the Spanish flu pandemic, 1919. Estimates for the death toll in China have varied widely, [292] [98] a range which reflects the lack of centralized collection of health data at the time due to the Warlord period. China may have experienced a relatively mild flu season in 1918 compared to other areas of the world.
With winter lurking around the corner comes the looming threat of the dreaded flu season.According to the National Institutes of Health (NIH), the seasonal influenza virus (or the flu ...
Flu season is an annually recurring time period characterized by the prevalence of an outbreak of influenza (flu). The season occurs during the cold half of the year in each hemisphere. It takes approximately two days to show symptoms. Influenza activity can sometimes be predicted and even tracked geographically.
Now, flu cases have rebounded, with an estimated 26 to 50 million flu cases, 290,000 to 670,000 hospitalizations, and 17,000 to 98,000 deaths from flu last year, per the CDC. (The data is still ...
Influenza A virus subtype H7N7 (A/H7N7) is a subtype of Influenza A virus, a genus of Orthomyxovirus, the viruses responsible for influenza.Highly pathogenic strains (HPAI) and low pathogenic strains (LPAI) exist.
This season, the flu has already claimed the lives of roughly 1,500 people across the country, including nine children. Five youngsters’ deaths were recorded between Dec. 15 and Dec. 21.
H5N6 is a subtype of the species Influenza A virus (sometimes called bird flu virus). Infected birds shed the virus in their saliva, mucus, and feces. The virus was first detected in poultry in 2013, since then spreading among wild bird populations and poultry around the world.