Phizer https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8184133/pdf/12249_2021_Article_2058.pdf https://www.nature.com/articles/s41586-021-03275-y.pdf https://www.nejm.org/doi/pdf/10.1056/NEJMoa2024671?articleTools=true studii clinice faza 1 si 2: https://www.nature.com/articles/s41586-020-2639-4 https://www.nejm.org/doi/full/10.1056/nejmoa2034577 https://cdn.pfizer.com/pfizercom/2020-11/C4591001_Clinical_Protocol_Nov2020.pdf https://www.cdc.gov/vaccines/acip/meetings/downloads/slides-2021-11-2-3/02-COVID-Gurtman-508.pdf Moderna https://eua.modernatx.com/covid19vaccine-eua/providers/clinical-trial-data