For persons aged 12 and above, WHO recommends the dosage of the booster dose is half the dose used in the primary vaccination series (50 µg at 0.25 ml).
The benefits of booster vaccination are recognized following increasing evidence of waning vaccine effectiveness against mild and asymptomatic SARS-CoV-2 infection over time.
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目前没有对12岁以下儿童进行第一次或第二次加强接种的建议，但免疫功能低下儿童除外。
There is currently no recommendation for either first or second booster doses in children under the age of 12, except for children with immunocompromising conditions.
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这种疫苗可与其他疫苗“混搭”接种吗？
Can this vaccine be ‘mixed and matched’ with other vaccines?
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免疫战略咨询专家组认为，接种世卫组织紧急使用列表内两种不同的COVID-19疫苗属于完成基础接种。
SAGE accepts two heterologous doses of WHO EUL COVID-19 vaccines as a complete primary series.
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对于考虑采用异源免疫程序的国家（例如，使用不同的COVID-19疫苗平台），世卫组织提出以下建议：
For countries considering heterologous schedules, (e.g.
Either of the WHO EULCOVID-19 vectored vaccine (Janssen or AstraZeneca Vaxzervia/COVISHIELD) can be used as a second dose following a first dose of the Moderna vaccine, dependant on product availability.
The Moderna vaccine can also be used as a second dose following any of the WHO EUL COVID-19 inactivated vaccines (Sinopharm, Sinovac or Bharat) or any of the vectored vaccines (Janssen or AstraZeneca Vaxzervia/COVISHIELD)
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莫德纳疫苗也可在接种世卫组织紧急使用列表中的任一种COVID-19疫苗之后用作加强剂。
The Moderna vaccine can also be used as a booster dose following any of the COVID-19 vaccines with WHO EUL.