The area for giving pre-vaccination advice to medical workers at Branch No 2 of the National Hospital for Tropical Diseases in Hanoi (Photo: VNA)

The area for giving pre-vaccination advice to medical workers at Branch No 2 of the National Hospital for Tropical Diseases in Hanoi (Photo: VNA)

The area for giving pre-vaccination advice to medical workers at Branch No 2 of the National Hospital for Tropical Diseases in Hanoi (Photo: VNA)

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