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Chicken with bird flu | 22 April 2005 Source: 
The number of deaths of people infected with bird flu in northern Vietnam has dropped from 70 per cent to 20 per cent, says the World Health Organization (WHO) office in Hanoi.
This is not necessarily a good thing, it warns. The fall in deaths could mean that the virus, H5N1, is becoming less deadly but more infectious, meaning that although fewer people die from it, it could spread farther and faster. Some scientists believe viruses use this tactic because killing people they infect would reduce their chance of infecting others. |