Vaccines are the key for preventing the zoonotic virus pandemic caused by SARS-Cov-2 with no specific antidote. Various countries are working to roll out the vaccines. There are four categories of vaccines in clinical trials namely; WHOLE VIRUS, PROTEIN SUBUNIT, VIRAL VECTOR and NUCLEIC ACID (RNA AND DNA). Some of them try to induce the antigen into the body, while others use the body's own cells to make the viral antigen. Till February 2021, at least seven different vaccines across three different platforms have been rolled out in various countries. Around 100 plus vaccine candidates are in development in different phases.
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