一种新的流感疫苗以无痛的鼻喷剂接种，对儿童有效。
A new influenza vaccine, administered painlessly in a nasal spray, is effective for children.
他们应该每年接受流感疫苗接种。
NEJM的一项研究还显示，许多美国老年人和1976年猪流感疫苗的接种者可能都已经对这种新病毒有了免疫力。
One of the NEJM studies also showed that many older Americans as well as recipients of the 1976 swine flu vaccine may already be protected against the new virus.
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