This is called passive immunisation.

这叫作被动免疫。

And immunisation requires repeated vaccinations.

而且免疫是需要反复接种的。

A school immunisation programme began last month for all girls aged 12 and 13.

上月英国一项学校免疫计划启动，将为12、13岁的所有女孩作免疫接种。

Professor David Salisbury, director of immunisation at the Department of Health, said that such worries were "theoretical, with no evidence".

卫生部免疫接种主管戴维·斯伯里教授说这种担心是“假设，没有证明的”。