The new vaccine, which is different from the annual flu vaccine, is available ahead of expectations.
与每年的流感疫苗不同的是，这种新疫苗提前上市了。
When will the swine flu vaccine be available?
猪流感有哪些症状？
The vaccine provides longer immunity against flu.
这种疫苗对流感的免疫效力时间较长。
The vaccine provides longer immunity against flu.
这种疫苗对流感的免疫效力时间较长。
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