“Persons of all ages who are eligible to receive the Sinovac-CoronaVac vaccine are recommended to receive three doses of the vaccine as their primary vaccination series. The second dose should be taken 28 days after the first dose, while the third dose should be taken 90 days after the second dose. The recommended timing of the third dose corresponds to when antibody levels are known to have declined”
第二是科兴疫苗是不推荐作为加强剂的
"The Sinovac-CoronaVac vaccine is not recommended for use as a booster vaccination, except in persons who are unable – for medical reasons – to receive a third dose of the mRNA vaccine. Persons who have completed two doses of the mRNA vaccine without allergies or severe adverse events, are recommended to receive an mRNA vaccine instead of the Sinovac-Coronavac vaccine, if they are eligible for a booster."