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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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Deadly Bird Flu In China Evolves, Spreads To New Regions : Goats ... - NPR Thu, 07 Sep 2017 20:51:10 GMT

NPR

Deadly Bird Flu In China Evolves, Spreads To New Regions : Goats ...
NPR
In the 2017 outbreak, the Chinese government reported 759 cases of the H7N9 avian flu, with 281 deaths. By comparison, in 2016 there were 123 cases.
Deadly Bird Flu In China Evolves, Spreads To New RegionsMaine Public
Record Bird Flu Epidemic in China (MMWRMedPage Today

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Don't Blame Pigs for Swine Flu—Species Hopping Is How Viruses ... - WIRED Mon, 18 Sep 2017 13:01:12 GMT

WIRED

Don't Blame Pigs for Swine Flu—Species Hopping Is How Viruses ...
WIRED
The discovery that viruses move between species unexpectedly often is rewriting ideas about their evolutionary history—and may have troubling implications for ...

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KZN birds culled after avian flu virus detected | The Mercury - IOL - Independent Online Wed, 30 Aug 2017 06:50:56 GMT

Independent Online

KZN birds culled after avian flu virus detected | The Mercury - IOL
Independent Online
A number of birds have been culled in KwaZulu-Natal following the detection of the HPAI H5N8 virus – also known as avian influenza – in the province.
Some 60‚000 birds culled as avian flu lands in KZN - Times LIVETimes LIVE

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Palace: No bird-to-human infection yet from avian flu virus in PHL - GMA News Sat, 26 Aug 2017 06:13:20 GMT

GMA News

Palace: No bird-to-human infection yet from avian flu virus in PHL
GMA News
Malacañang on Saturday said there has been no documented case yet of bird-to-human infection from a stronger avian flu virus in the country. "The results are in —all those who showed flu-like symptoms have already tested negative for the AH5N6 virus, ...
DA conducting study to trace source of bird flu virus | SunStarSun.Star
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Philippines on alert for bird flu cases in humans - ASEAN/East Asia ...The Star Online
benarnews -Business Insider -Philippine Star
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Cagayan Valley poultry tested negative for bird-flu virus - Pia.gov.ph - Philippine Information Agency Sun, 10 Sep 2017 14:32:37 GMT

Cagayan Valley poultry tested negative for bird-flu virus - Pia.gov.ph
Philippine Information Agency
TUGUEGARAO CITY, Cagayan, Sept. 5 (PIA) -- All blood samples extracted from poultry in various areas regionwide were found to be negative of the Avian ...

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DA urged to prevent spread of bird flu virus - Minda News Tue, 29 Aug 2017 13:50:36 GMT

Philippine Star

DA urged to prevent spread of bird flu virus
Minda News
DAVAO CITY (MindaNews/29 August) – The Department of Agriculture (DA) must prevent the infestation of flies in areas affected by bird flu to avoid the transmission of H5 strain of the avian influenza to other parts of Luzon, an inventor said Tuesday.
Q3 growth unaffected by bird flu outbreakPhilippine Star
Duterte hails Kapampangans for resiliency vs bird flu | SunStarSun.Star
Philippines: No human bird flu cases so far, Duterte dines on Pampanga poultryOutbreak News Today
Malaya -Fox Business
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H7N9 Avian Flu Continues to Spread, Worsen in China - Medscape Tue, 12 Sep 2017 12:57:21 GMT

Medscape

H7N9 Avian Flu Continues to Spread, Worsen in China
Medscape
Twenty-seven patients were infected with high-pathogenic avian influenza strains that had acquired mutations. Sequencing data from 166 viral isolates collected during the fifth epidemic uncovered genetic markers of resistance to amantadine and ...

Department of Agriculture: Philippines not yet bird-flu free - SunStar - Sun.Star Thu, 07 Sep 2017 17:05:42 GMT

Department of Agriculture: Philippines not yet bird-flu free - SunStar
Sun.Star
THE Department of Agriculture (DA) said the country is still not yet bird-flu free despite the successful slaughtering of infected poultry animals and culling ...

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Should you be afraid of 'bird flu'? Expert explains avian influenza ... - ABS-CBN News Tue, 29 Aug 2017 10:54:44 GMT

ABS-CBN News

Should you be afraid of 'bird flu'? Expert explains avian influenza ...
ABS-CBN News
Although some strains of the avian influenza is transmittable to humans, Dr. Gundo Weiler of the World Health Organization explains that the chance is usually ...

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PHOTO ESSAY: Bird flu grounds racing pigeons - Independent Online Wed, 30 Aug 2017 13:26:20 GMT

Independent Online

PHOTO ESSAY: Bird flu grounds racing pigeons
Independent Online
GROUNDED: Owners of racing pigeons have been urged to keep their birds indoors out of concern about the avian flu outbreak. Picture: David Ritchie/ANA Pictures. Cape Town - The recent outbreak of the avian flu virus has the racing pigeon industry all ...

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