COVID-19 January 4, 2021 Vaccine of Corona! Dry run of vaccine ! How vaccine work ! Covishield! Covaxin! Pfizer ! Khan sir !corona vaccine has been given an emergency approval by the government and is expected to be given to public by republic day. Two vaccine, covishield from serum institute and Covaxin from bharat biotechnology have got approval.. Both vaccines are 70…
NUTRITION November 19, 2020 Khan sir science | khan sir biology | vitaminsThis is not official channel of khan sir .