The whole poultry industry has problems with this. They are never going to be able to win in the long run. This kind of crap has to have been around for ages, probably as long as birds have been migrating
Check this out link out for more background also (lots about it everywhere)
http://www.manorcourtvets.co.uk/AvianNewsPage.htm(snip) (about 1/4 way down)
More than 3 months after the outbreak of avian influenza in several Asian countries, with 23
human deaths in Thailand and Viet Nam, the situation has improved in China, Thailand and Viet
Nam, according to the two organizations. "The crisis is still not over," FAO and OIE warned. "In
countries such as Indonesia, Laos, Cambodia and Thailand, further outbreaks could still flare up.
The virus could spread again within and between countries. As long as the H5N1 virus is not fully
under control, the potential threat to human health remains." In particular, appropriate
precautionary measures have to be put in place to ensure that infected zones become free from
infection and remain so. Before countries resume restocking, they must apply strong surveillance
and biosecurity measures, to ensure that potential new infections are discovered and contained
immediately, FAO and OIE said. The absence of the virus has to be proved by virus search and
serological surveys. In countries applying vaccination programmes, non-vaccinated susceptible
chickens, so-called "sentinel animals", should be used. The movement of poultry and
contaminated goods must be carefully monitored to avoid the reintroduction of the virus from
affected areas. Contact between wild and domestic birds has to be minimised. Up to date, at
least 100 million birds have died or have been culled to control the disease.
March]
(snip)