Below is the timeline of the cases of Sikkim: On January 1, 2021, the Drug Controller General of India, approved the emergency or conditional use of AstraZeneca's COVID-19 vaccine AZD1222 (marketed as Covishield).[42] On January 2, 2021, BBV152 (marketed as Covaxin), first indigenous vaccine, developed by Bharat Biotech in association with the Indian Council of Medical Research and National Institute of Virology received approval from the Drug Controller General of India for its emergency or conditional usage.[43] On 14 January 2021 first batches of Covaxin vaccine was despatched from the Bharat Biotech, albeit it was still in the third phase of testing.[45] On 21 February, 2022, Drugs Controller General of India granted approval to Biological E's COVID-19 vaccine Corbevax, that can be used for children between 12 and 18 years of age.[49] On 19 February 2022, India crossed 1.75 billion Covid vaccines milestone in the country.