从大海里捞出3根 针，我看你能捞出来吗？？？

How are the viruses for flu vaccine chosen?
Each year, experts study thousands of flu virus samples from around the world to figure out which viruses are making people sick and how these viruses are changing; with this information, they forecast which three viruses are most likely to make the most people sick during the next flu season. Other considerations include1) how well the current vaccine protects against the viruses forecasted to cause a lot of illness in the next season and2) if these viruses can be used to make a new vaccine if needed. As soon as experts decide which three viruses should be used to create the next season’s vaccine, vaccine producers begin making vaccine.

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• 如果这些专家真能捞出这3根针，买奖券去吧！还预测什么 -7117- ♂ (22 bytes) () 11/22/2008 postreply 18:23:54