Ranjan, Alok, Purushottam Kumar, Manisha Verma, Chandramani Singh, Sanjay Pandey, Bijaya Nanda Naik, Santosh Kumar Nirala, and Rajath Rao. 2022. “Role of BCG and Measles Vaccination in Protection Against COVID-19 Infection and Severity of the Disease: A Pilot Case-Control Study”. National Journal of Community Medicine 13 (02):108-13. https://doi.org/10.55489/njcm1322022160.