nphuongvy219 nphuongvy219

05-05-2024
Biology

Answered

hãy giải thích tại sao chúng ta cần tiêm nhiều mũi vắc xin phòng bệnh do virus sars -cov-2 gây ra ,trong khi vaccine phòng bệnh quai bị hoặc 1 số bệnh khác chỉ cần tiêm 1 lần trong đời?

Answer :

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