https://www.bharatbiotech.com/images/covaxin/covaxin-fact-sheet.pdf
https://www.thelancet.com/pdfs/journals/lancet/PIIS0140-6736(20)32661-1.pdf
https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(20)32661-1/fulltext
https://nihrecord.nih.gov/2020/12/11/nih-moderna-covid-19-vaccine-shows-promising-interim-results
https://www.cdc.gov/mmwr/volumes/69/wr/mm695152e1.htm?s_cid=mm695152e1_w