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Subject <<Advancing Bird Flu-H5N1...now its Vietnam and spreading?

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This next article shows just how unexpected and potentially easy it can be for viruses to recombine to form a new virus, even when these viruses are being used in vaccines.

This experienced has occurred here in Australia and has affected chickens.

[i][b]Scientists have found that 2 virus strains used to vaccinate chickens in Australia may have recombined to form a virus that is sickening and killing the animals. "This shows that recombination of such strains can happen, and people need to think about it," says Glenn Browning, a veterinary microbiologist at the University of Melbourne, Parkville in Australia and one of the co-authors on the paper.

Chickens worldwide are susceptible to a group of herpesviruses called ILTV, which target their upper respiratory tract. The resulting disease, called infectious laryngotracheitis, reduces egg production and can kill up to 1/5th of those infected. "The birds effectively choke to death on blood and mucus," says Browning. The disease is not known to infect any animals other than chickens and chicken-like birds.

To combat ILTV, farmers vaccinate their chickens with attenuated herpesviruses that can still infect and replicate but do not lead to disease. Australia has used 2 vaccines, which are produced by Pfizer and called SA2 and A20. In 2006, however, the country purchased a new vaccine from the European company Intervet called Serva. 2 years later, new strains of ILTV, called class 8 and 9, appeared. They are just as deadly as other strains. "But they seem to be dominating over the strains that were reported prior to 2007," says Browning.

Because the new strains appeared shortly after the European vaccine was introduced, scientists thought that the new vaccine strain might have reverted back to a disease-causing form. But when the researchers sequenced the genomes of the 2 new strains and the 3 vaccine strains, they found that the new viruses were actually stitched together from the European and Australian vaccines. Although it is not clear what mutations keep the vaccine strains from causing disease in the 1st place, they were probably lost when the viruses recombined, says Browning, whose team reports its findings online today [12 Jul 2012] in Science.[/b][/i]

Link here...

http://www.promedmail.org/

In the top left menu under the heading...

[i][b]28 Oct 2012 Vaccine combination, poultry - Australia: deadly[/b][/i]
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Original Message I previously engaged in several threads regarding the potentially devestating potential of H5N1.

Some readers who havent even attempted to gain any sort of education have downvoted my thread to the point that no-one got the chance to read and learn, on a topic that I have been closely monitoring for several years, ever since the World Health Organization announced their concerns for it to go pandemic.

Now the following link is showing its steady but relentless advance and in all probability its eventual final evolutionary mutation to become an airborne dissease that will readily spread throughout humanity with devistating effects.

link here:

[link to hisz.rsoe.hu]

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