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Theory of COVID-19 vaccines

The causative virus of COVID-19 “SARS-COV2” is an upper respiratory tract pathogen and a member of corona virus family, causes about 15 % of influenza and common cold infections annually. There are several types of viruses that causes influenza to human like orthomyxovirus type A, B, and C. some may cause sever and endemic flu like orthomyxovirus-A, some may be simple and do not spread like endemics.