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与已经接触过流感的成人相比,未发生过流感的小儿接种流感疫苗后产生的保护作用短暂,表现为接种后抗体反应低且迅速下降。有人报告,大于25岁者接种一次猪流感
Compared with adults who have been exposed to influenza, the protective effect of flu vaccination in infants who have not had flu is brief, showing a low and rapidly decreasing antibody response after vaccination. It was reported that swine flu was administered to those over 25 years of age