The biggest shock to vaccine discovery!
Due to the coronavirus constantly changing its mutation. There are many fears that this vaccine will affect the new virus. Meanwhile, there have been reports that the 45-year-old nurse became corona positive within 8 days of taking Pfizer vaccine. This shows the warning that the virus is constantly updating. So we have to constantly update the vaccine. Because in the coming times, the virus's ability to kill can increase. The disease caused by the corona virus looks like abnormal disease.