Effectiveness of COVID-19 Vaccines against SARS-CoV-2 Infection among Persons Attending the RT-PCR center at a Medical College Hospital in Telangana: A Case- Control Study.

Background: In January 2021, India's drug regulator issued restricted emergency approval for COVISHIELD and COVAXIN, which were manufactured in India. In mid-January 2021, in India, there were 10.5 million confirmed cases and 0.