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。

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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