By 21 days post-challenge, gross and microscopic lesions of lymph nodes and lungs in non-vaccinated but challenged pigs were significantly more severe than those found in vaccinated groups.

在攻毒后21天剖检，攻毒对照猪的淋巴结和肺脏的大体和显微病变都比免疫组猪严重。

youdao

An outbreak is most likely to happen among small groups of children who haven't been vaccinated.

这爆发很可能是在未接种的少数儿童群体发生。

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All children and adolescents younger than 18 years old and not previously vaccinated should receive the vaccine. People in high risk groups should also be vaccinated, including.

所有儿童和18岁以内的青少年以及以前未接种疫苗的人均应接种疫苗。

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An advisory committee of the Centers for Disease Control and Prevention said there are five groups that should be vaccinated first.

VOA: special.2009.08.18

If vaccine supplies are limited, then the committee says two groups of children should be vaccinated before other children.

VOA: special.2009.08.05

The Chief Medical Officer Dr Ruth Hussey said she wanted to encourage as many people as possible in high risk groups to get vaccinated.

BBC: Flu jab given at some pharmacies in Wales for first time

The DoH has therefore launched a campaign to encourage at-risk groups to get vaccinated and a new website, called Winterwatch, will be launched later this month to provide winter-related health data.

BBC: Number of pensioners taking free flu jab falling

The three researchers organised children whose social circumstances were similar into groups, depending on whether or not the children had been vaccinated against a range of diseases including measles, polio and tuberculosis.

ECONOMIST: Vaccination