The vaccine is derived from the most commonly circulating strain of rotavirus, and also offered good protection against some other strains across the two-year period.

这种疫苗是根据最常见的轮状病毒毒株制成的，而且在两年的时间里也能很好地保护人体不受其它一些毒株的感染。

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Give your eyes time to relax, and a chance to get the blood circulating to prevent eye strain and stiff muscles.

要让眼睛放松，使血液循环尽可能顺畅，以防止眼睛疲劳和肌肉僵硬。

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A seasonal flu in the same H1N1 family as the pandemic virus has been circulating since 1977, but until now it was thought that this seasonal virus did not induce immunity to the pandemic strain.

自从1977年以来与H1N1族相同的季节流感作为大流行病毒一直在传播，但一直到现在为止，人们认为季节流感病毒对大流行病毒株不能产生免疫性。

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That said, it is still possible to get the flu, (a different circulating strain), but the chances are much less likely.

FORBES: 2013 Flu Season: How to Protect Yourself

Mr Reddy stressed that there were no signs of a tamiflu-resistant strain of H1N1 circulating in the community.

BBC: Tamiflu

People who live in institutions, such as a university, school or hospital, are particularly prone to getting any new strain that is circulating.

BBC: The flu virus that nearly killed me