Friday, November 18, 2005

How are bird flu viruses different from human flu viruses?

"There are many different subtypes of type A influenza viruses. These subtypes differ because of certain proteins on the surface of the influenza A virus (hemagglutinin [HA] and neuraminidase [NA] proteins). There are 16 different HA subtypes and 9 different NA subtypes of flu A viruses. Many different combinations of HA and NA proteins are possible. Each combination is a different subtype. All known subtypes of flu A viruses can be found in birds. However, when we talk about “bird flu” viruses, we are referring to influenza A subtypes chiefly found in birds. They do not usually infect humans, even though we know they can. When we talk about “human flu viruses” we are referring to those subtypes that occur widely in humans. There are only three known A subtypes of human flu viruses (H1N1, H1N2, and H3N2); 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."
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Saturday, November 05, 2005

Eyewitness: Surviving bird flu

"Nguyen Thanh Hung knows he has been lucky.

The 42-year-old construction materials salesman has just been released from Hanoi's Hospital for Tropical Diseases, where both he and his older brother were patients.

Hung is now back at home with his wife and children. But his brother Nguyen Hung Viet died from his illness. Bird Flu Facts for Your Protection

Hung still does not know how they both contracted H5N1, the often deadly virus that causes the respiratory illness bid flu.

"I guess we both got it from the last meal we shared together," Hung said.

"I'd just got back to Thai Binh, where I'm originally from, to visit my brothers. They threw a welcoming dinner where we had our favourite dish, 'tiet canh', which is made with chopped congealed raw duck blood and herbs.

"The duck was plump and looking healthy, so we didn't have the slightest suspicion that it might be sick. Moreover, we were thinking chicken flu only exists in the south of the country," he said.

Just one day after the meal, Hung's eldest brother fell sick with a temperature.

But the family waited a whole week before they finally took him to hospital."

http://news.bbc.co.uk/1/hi/world/asia-pacific/4226459.stm
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Thursday, November 03, 2005

Romanian villages tackle bird flu

"A freshening wind and steady rain pound the olive green waters of the Danube delta. Flocks of swans flap heavily through a grey sky.

On the banks of the river, white and grey geese waddle as usual, but the villagers are wary of each passing boat. Police and border guard launches speed to and fro.

This is an area blighted by avian flu. There are confirmed cases in three villages, and several other suspicious cases of dead birds are under investigation.

"I never thought it would come to this," said Lefter Chirica, the government appointed official responsible for Tulcea County.

"It's like a science fiction film - men in strange overalls, walking through our villages."

New measures

The men are from the local veterinary authority, collecting geese, ducks and hens for slaughter in the villages of Maliuc and Vulturu, and disinfecting the yards of houses and even the muddy lanes of the villages.

As we approach the two villages in a hired boat, a police boat appears from nowhere, ordering us to turn back.

When we explain that we have no intention of landing in the quarantined area, we are reluctantly allowed to proceed - under escort.

The village of Gorgova is only 5km (three miles) downstream from Maliuc. At the main landing stage, we m"

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