Recruiting volunteers for vaccine trials. The first volunteer received the first shot in the first phase of vaccine trials on December 17 (Photo: VNA)

Recruiting volunteers for vaccine trials. The first volunteer received the first shot in the first phase of vaccine trials on December 17 (Photo: VNA)

Recruiting volunteers for vaccine trials. The first volunteer received the first shot in the first phase of vaccine trials on December 17 (Photo: VNA)

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