一年一度的季节性流感疫苗注射已经开始了，让许多成年人开始怀疑每年一次的流感疫苗注射是否适合他们。
The annual jab fest for the seasonal flu is already underway, leaving many grown-ups wondering if the annual stick in the arm is right for them.
该领域的专家表示，到2010年，如果存在相应需求的话，季节性流感疫苗的年生产能力预计会增至10亿剂。
According to experts working in this field, the yearly production capacity for seasonal influenza vaccine is expected to rise to 1 billion doses in 2010, provided corresponding demand exists.
含佐剂的季节性流感疫苗以前主要是给老年人使用，因而我们目前还不清楚它在年轻人身上是否有副作用。
The seasonal flu vaccines with adjuvants have mostly been given to older people, so we cannot yet be sure that these vaccines do not have very rare side effects in younger people.
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