Vaccine certificate during domestic traveling: a potential initiative to prevent COVID-19 waves in India.

India, the second-most populous country in the world, is struggling with the second wave of the COVID-19 triggered by SARS-CoV-2. This letter aims to highlight the necessity of the vaccine certificate during nationwide traveling to prevent further waves of the COVID-19 in the different states of India. Such policies have already been in existence for international travel termed as vaccine passports. The compulsory vaccine certificates need to be in existence to prevent the rapid spread of the COVID-19 as well as the future waves of this pandemic in India. There is an urgent need forStandard Operating Procedure (SOP) on preventive measures to control the spread of COVID-19 nationwide by including the vaccine certificate for domestic travel between the cities and states.