同时，在医院外的感染人数也下降了百分之17。 不过这些接受调查的人都是和医疗系统有过接触的。

There was also about a 17 percent decrease in the infections that start in people outside the hospital, but are in people that have contact with the health care system.

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迄今确定的接触者总人数为327人。

So far, a total of 327 contacts have been identified.

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接触二手烟人数在黑人不吸烟者中间下降的幅度不如白人和美籍墨西哥人。

The decline is secondhand smoke exposure was not as dramatic in black nonsmokers as it was in whites and Mexican-Americans.

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