![]() ![]() The emergence and spread of variant strains of SARS-CoV-2 has altered the disease transmission dynamics, thus creating a need for continuously monitoring the real-world effectiveness of various vaccines and assessing their overall impact on disease control. Till date, 11 vaccines have been included in the WHO's emergency use list. Since then, efforts were initiated to develop safe and effective vaccines. 16 Indian Council of Medical Research, New Delhi, India.ĬOVID-19 was declared a pandemic by the World Health Organization (WHO) on March 11, 2020. ![]()
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