The Covid-19 pandemic has led to huge drops in childhood vaccinations, leaving countries more vulnerable to disease outbreaks, the World Health Organization has warned.
世界卫生组织(WHO)警告称，新型冠状病毒肺炎（COVID-19，即2019冠状病毒病）疫情已导致儿童疫苗接种率大幅下降，使相关疾病更容易在各国爆发。
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