HANOI, BANGKOK -As France and the Netherlands move ahead with plans for bird-flu vaccinations, two Southeast Asian countries offer different lessons for Europe about how best to keep the deadly H5N1 virus from taking hold in the human population. In Vietnam, the country hardest hit by bird flu in the world, an aggressive vaccination program involving 241 million chickens and ducks appears to have had dramatic results with no new outbreaks in poultry for one month and no human deaths since November. Thailand, on the other hand, has also brought bird flu under control for the time being but without vaccinations - because to do so would further damage the country's once-robust frozen-chicken exports.
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