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Bird flu virus

Avian influenza is an infection caused by avian (bird) influenza (flu) viruses. These bird flu viruses occur naturally among birds. Wild birds worldwide carry the viruses in their intestines, but usually do not get sick from them. However, avian influenza is very contagious among birds and can make some domesticated birds, including chickens, ducks, and turkeys, very sick and kill them.

There are many different subtypes of type A influenza viruses. These subtypes differ because of changes in certain proteins on the surface of the influenza A virus (hemagglutinin [HA] and neuraminidase [NA] proteins). There are 16 known HA subtypes and 9 known NA subtypes of influenza A viruses. Many different combinations of HA and NA proteins are possible. Each combination represents a different subtype. All known subtypes of influenza A viruses can be found in birds.

Usually, "bird flu virus" or “avian influenza virus” refers to influenza A viruses found chiefly in birds, but infections with these viruses can occur in humans. The risk from avian influenza is generally low to most people, because the viruses do not usually infect humans.

However, confirmed cases of human infection from several subtypes of avian influenza infection have been reported since 1997. Most cases of avian influenza infection in humans have resulted from contact with infected poultry (e.g., domesticated chicken, ducks, and turkeys) or surfaces contaminated with secretion/excretions from infected birds. The spread of bird flu viruses from one ill person to another has been reported very rarely, and has been limited, inefficient and unsustained.

“Human influenza virus” usually refers to those subtypes that spread widely among humans. There are only three known A subtypes of influenza viruses (H1N1, H1N2, and H3N2) currently circulating among humans. It is likely that some genetic parts of current human influenza A viruses came from birds originally. Influenza A viruses are constantly changing, and they might adapt over time to infect and spread among humans.

During an outbreak of bird flu among poultry, there is a possible risk to people who have contact with infected birds or surfaces that have been contaminated with secretions or excretions from infected birds. It is only if the birf flu virus mutates to become contagious amongst humans that it could spread easily between the populations of the world, and that is the potential global bird flu pandemic that is worrying so many health agencies around the world.

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bird flu virus - Google News
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Hong Kong's bird market to close for 21 days after avian flu virus found in sample - Hong Kong Free Press Fri, 13 Apr 2018 16:05:27 GMT

Hong Kong Free Press

Hong Kong's bird market to close for 21 days after avian flu virus found in sample
Hong Kong Free Press
According to HK01, the department disposed of 2,834 birds at the store. The department required all shops in the garden to clean their stalls thoroughly. It said cleansing of the bird garden and its vicinity will be stepped up. “People should avoid ...

'Bird flu-free' tag still 'iffy' as surveillance extended in hot zones - Business Mirror Tue, 24 Apr 2018 13:30:29 GMT

'Bird flu-free' tag still 'iffy' as surveillance extended in hot zones
Business Mirror
REGAINING the country's once-precious moniker—a bird flu-free nation—remains up in the air as animal-health experts chose to extend monitoring and surveillance of areas hit by the dreaded avian influenza (AI) virus eight months ago. According to the ...

Japan's 1st deadly mass avian flu infections among wild ground birds hits crows in Hyogo - The Mainichi Thu, 12 Apr 2018 08:02:52 GMT

The Mainichi

Japan's 1st deadly mass avian flu infections among wild ground birds hits crows in Hyogo
The Mainichi
Since last fall, when the current avian flu season set in, jungle crows that were found dead at Koyaike Park in Itami, Hyogo Prefecture, have accounted for some 70 percent of dead wild birds across the country that have been put to simple virus tests ...

Grey Heron, tagged for bird flu programme, sighted after 4 years in ... - The Indian Express Tue, 24 Apr 2018 04:58:22 GMT

The Indian Express

Grey Heron, tagged for bird flu programme, sighted after 4 years in ...
The Indian Express
In a first, a Grey Heron that was ringed and tagged as part of the bird flu surveillance programme was sighted again after four years at Bhadalwadi tank in Indapur tehsil of Pune district in March this year. The sighting, four years after the ...

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Bird flu scare shuts down popular songbird garden in Hong Kong for ... - South China Morning Post Fri, 13 Apr 2018 10:17:25 GMT

South China Morning Post

Bird flu scare shuts down popular songbird garden in Hong Kong for ...
South China Morning Post
Cleansing operation launched after hill mynah sample from a shop tested positive for the H5 virus, but store owners are still selling feed over fences set up to isolate the area.
Mong Kok bird garden shut over avian virus - The StandardHong Kong Standard (press release)

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Microbiologists Identify Genes Necessary for Flu Virus Infiltration - The Chicago Maroon Tue, 24 Apr 2018 03:56:41 GMT

The Chicago Maroon

Microbiologists Identify Genes Necessary for Flu Virus Infiltration
The Chicago Maroon
Graduate student Julianna Han and her team of researchers in the microbiology department have located two genes shared in cells resistant to H5N1 flu—more commonly known as avian flu—revealing new explanations for how the flu infiltrates cells. It is ...

New bird flu virus H6N2 comes to roost - Times of India Mon, 02 Apr 2018 05:52:42 GMT

New bird flu virus H6N2 comes to roost
Times of India
The research was carried out by teams from the National Institute of High Security Animal Diseases, Bhopal, and the Northeastern Regional Disease Diagnostic Laboratory, Guwahati. “The recent reports of human infection due to H6 subtype avian influenza ...

Avian flu freezes coastal bird research in South Africa - Nature - Nature.com Thu, 29 Mar 2018 14:42:55 GMT

Nature.com

Avian flu freezes coastal bird research in South Africa - Nature
Nature.com
Endangered African penguins are among several species hit by influenza, prompting an unprecedented research ban to contain the virus.
Single vaccine developed for avian flu, duck enteritis | FeedstuffsFeedstuffs

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Hong Kong pet bird market temporarily closed amid detection of bird flu virus - Xinhua Sat, 14 Apr 2018 10:51:58 GMT

Hong Kong pet bird market temporarily closed amid detection of bird flu virus
Xinhua
HONG KONG, April 14 (Xinhua) -- The government of China's Hong Kong Special Administrative Region (HKSAR) has announced the closure of a pet bird market after the detection of bird flu virus in a bird shop. A spokesman for the Agriculture, Fisheries ...

Doctor stands firm on bird-flu warning amid govt denials - The Nation - The Nation Tue, 27 Mar 2018 18:08:48 GMT

The Nation

Doctor stands firm on bird-flu warning amid govt denials - The Nation
The Nation
Top officials reject concerns about H5N1 after dead animals found at zoo.

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