Immunity to H1N1 on the rise: WHO
China Daily | Updated: 2010-01-09 07:42
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A man receives the H1N1 vaccine in Panama City on Wednesday. The Panama's Ministry of Health began a massive vaccination campaign against the H1N1 flu virus throughout the country with the first purchase of 300,000 doses of the vaccine. Reuters |
Yet as virus recedes, a new strain could take its place
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