γ
2019冠状病毒病（COVID-19）疫情
https://www.who.int/zh/emergencies/diseases/novel-coronavirus-2019
COVID-19疫苗
https://www.who.int/zh/emergencies/diseases/novel-coronavirus-2019/covid-19-vaccines
COVID-19候选疫苗状况草表
https://www.who.int/publications/m/item/draft-landscape-of-covid-19-candidate-vaccines
