The study also provided evidence of the so-called "herd immunity effect" in which unvaccinated older people benefit from the vaccination of children and infants.
该研究还提供了所谓“人群免疫效应”的证据，即接种了疫苗的婴幼儿使未接种过该疫苗的大龄人群受益。
The study also provided evidence of the so-called "herd immunity effect" in which unvaccinated older people benefit from the vaccination of children and infants.
该研究还提供了所谓“人群免疫效应”的证据，即接种了疫苗的婴幼儿使未接种过该疫苗的大龄人群受益。
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