Anyone who has not had been infected previously or been vaccinated can contract hepatitis A. People who live in places with poor sanitation are at higher risk.

凡以前没有感染过或没有接种疫苗者，均可能感染甲型肝炎。在卫生条件差的地方生活的人被感染的风险较大。

youdao

Take-home lesson: It's worth getting your family vaccinated even if the flu seems mild, if only because in some pandemics, the second wave has been deadlier than the first.

教训：鉴于有些传染病的第二波比第一波更为致命，即使在疫情还不太严重的时候，你也不妨让全家人都去打上一针疫苗。

youdao

The rule has many good provisions mandating control measures that producers must take, but it shied away from requiring that hens be vaccinated.

该规则对鸡蛋生产必须执行的强制控制措施作出了多项完善规定，但在要求蛋鸡接种问题上却没有直接规定。

youdao

So far it has proven effective at preventing the disease in half of those vaccinated which is more than ever before.

VOA: special.2009.12.07

The vaccine has already proven effective at preventing the disease in half of those vaccinated which is more than ever before.

VOA: special.2009.12.22

However, at the present time in our country, virtually nobody under age 35 has been vaccinated.

CNN: Dr. William Hall: Medical impact of bioterrorism

The family said they had no idea how Mr Colfer-Williams got measles as no close family member has it, including his three-year-old daughter who has been vaccinated.

BBC: Gareth Williams

Any staff member who has not been vaccinated must wear a mask while caring for any patient.

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