A study conducted by the National Institute of Virology (NIV) in Pune on 18 people showed that these people in Siddharth Nagar, Uttar Pradesh, had inadvertently received the Covishield and Covaxin vaccines at the same time. The results showed that the combined vaccination was the best option. Same as the two doses Covishield or Covaxin vaccines have better immunogenicity. The research was conducted by the National Institute of Virology of Pune ICMR and has not been peer-reviewed. India’s immunization program against Covid19 started in January this year, using two vaccines, AstraZeneca ChAdOx1nCov19 (known as Covishield in India) and inactivated whole virion BBV152 (Covaxin), after which the traditional or homologous primeboost method was used. . However, in May this year, a group of villagers were injected with Covaxin after the first Covishield injection during chaos among healthcare workers in Siddharthnagar, UP.