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How far has it spread?

Cases of infections among poultry and wild birds have already been reported in 49 countries.
As of 24 March 2006 there have been 185 cases of human infections and 104 deaths.

Nine countries have reported laboratory-confirmed human cases in the current outbreak which was first identified in Vietnam in December 2003.



 
A Threat to Influenza Pandemic AVIAN FLU


What is avian influenza?

Avian influenza, or bird flu, is a contagious disease of animals caused by viruses that normally infect only birds and, less commonly, pigs. Avian influenza viruses are highly species-specific, but have, on rare occasions, crossed the species barrier to infect humans.

In domestic poultry, infection with avian influenza viruses causes two main forms of disease, distinguished by low and high extremes of virulence. The so-called low pathogenic form commonly causes only mild symptoms (ruffled feathers, a drop in egg production) and may easily go undetected. The highly pathogenic form is far more dramatic. It spreads very rapidly through poultry flocks, causes disease affecting multiple internal organs, and has a mortality that can approach 100%, often within 48 hours.

 

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