For the epidemiologists of East Asia, April has been a cruel month. On the 6th, the outbreak of influenza that has afflicted millions of the region's birds claimed its 50th human victim, a young girl in Vietnam. The death came days after the authorities launched a huge campaign to disinfect every poultry farm and bird coop in the country in an effort to eradicate the disease. At the same time, news emerged that the virus known as H5N1 is also killing chickens in North Korea.
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