Prevalence of sero-protection (hemagglutination inhibition titer ≥ 1:40) among elderly age 75 years or older and those with age less than 75 years at study baseline, 1-month, 6-month and 12-month follow-up.
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Prevalence of sero-protection (hemagglutination inhibition titer ≥ 1:40) among elderly age 75 years or older and those with age less than 75 years at study baseline, 1-month, 6-month and 12-month follow-up.
创建时间：
2023-02-03
