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Influenza A (H5N1) | Send-To | Print | More
[syn: Bird Flu, Avian Influenza]
Category: Health & Medical Science | Editor's Choice | 1879 views
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© Centers For Disease Control And Prevention
Background: Influenza A (H5N1) is a subtype of the Type A influenza virus. Wild birds are the natural hosts of the virus, hence the name avian influenza or bird flu. The virus was first isolated from birds (terns) in South Africa in 1961. The virus circulates among birds worldwide. It is very contagious among birds and can be deadly to birds, particularly domesticated birds like chickens.
Infection: The virus does not typically infect humans. In 1997, however, the first instance of direct bird-to-human transmission of H5N1 was documented during an outbreak of avian influenza among poultry in Hong Kong; the virus caused severe respiratory illness in 18 people, of who 6 died. Since that time, there have been other instances of H5N1 infection among humans. But so far, H5N1 viruses have not been capable of efficient human-to-human transmission. This is something that is being watched carefully and is being investigated during this outbreak.
Spread: Infected birds shed virus in saliva, nasal secretions and feces. Avian influenza viruses spread among susceptible birds when they have contact with contaminated excretions. It is believed that most cases of H5N1 infection in humans have resulted from contact with infected poultry or contaminated surfaces.
Additional notice by the Author: In general all information presented and all items available for download are for public use.
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