Health officials urge everyone to get the flu vaccine before the winter season. 18 ...

全球从未接种过常规儿童疫苗的儿童（也称为零剂次儿童[zero-dose children]）数量下降了75% ... 研究疫苗接种覆盖率评估合作组（Global Burden of Disease Study Vaccine Coverage Collaborators）的最新分析结果，发现COVID-19大流行进一步加剧了这些挑战，导致数百万儿童暴露于 ...