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冠状病毒 surveillance vaccination sequencing conditions individual available condition Emergency
12-03
![世卫组织警告称，随着监测和疫苗接种的减少，可能会出现新的新冠病毒变种NewCOVIDvariantcouldemerge[图]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)