More and more people could take vaccines against COVID-19, so many people are happy about that. Nevertheless, they do not know how to make the choice. If they choose Moderna or BNT, they have to wait much longer for taking it. If they choose AZ, they are afraid of its side effects. In my opinion, the best vaccine is staying healthy. Staying healthy, we could make our immune system come into effect at no time once COVID-19 attacks us. Our immune system has been able to tackle COVID-19, because a lot of confirmed cases do not have symptoms. Many people die of COVID-19 only because their health conditions are not good. In other words, staying healthy, we would be all right even though getting COVID-19. In a word, the best vaccine is staying healthy^_^
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