For children aged 6 to 11 years, SAGE recommends 2 doses (50µg in 0.25 ml each), 4 weeks apart.
8342
对于6个月龄至5岁的儿童，免疫战略咨询专家组建议接种两剂（每次25µg，0.25毫升），间隔4周。
For children aged 6 months to 5 years, SAGE recommends 2 doses (25 µg [0.25 ml each), 4 weeks apart.
8343
世卫组织建议在接种第一剂疫苗4-8周后进行第二剂接种；
WHO recommends that the second dose should be administered 4–8 weeks after the first dose; an interval of 8 weeks between doses is preferred as this interval is associated with higher vaccine effectiveness and lower risk of myocarditis.
8344
建议遵循完整接种程序，两次接种可使用相同的产品。
Compliance with the full schedule is recommended and the same product can be used for both doses.
8345
免疫战略咨询专家组建议，应为重度和中度免疫功能低下者多接种一剂疫苗。
SAGE recommends that severe and moderately immunocompromised persons should be offered an additional dose of vaccine.
This is due to the fact that this group is less likely to respond adequately to vaccination following a standard primary vaccination series and are at higher risk of severe COVID-19 disease.
The first booster dose is recommended for the highest priority-use groups (e.g.
8349
如果基础接种的完成时间已超过6个月，应尽早接种加强剂。
older adults, persons with moderate to severe immunocompromising conditions, and health workers), 4-6 months after the completion of the primary series.
8350
世卫组织建议各国应考虑在为最高优先使用群体首次接种加强剂之后4-6个月进行第二次加强接种。
WHO recommends countries should consider a second booster dose 4-6 months after the first booster dose for the highest priority groups.