2021-09-20 Vaccines https://uspto.report/patent/app/20210046173?__cf_chl_jschl_tk__=pmd_WYagXVGdwAi.RTdWEcXe9.6hUQ9xxAWkcMV4jyWIPYg-1632095955-0-gqNtZGzNAiWjcnBszQlR https://uspto.report/patent/grant/10,933,127 https://cdn.pfizer.com/pfizercom/2020-11/C4591001_Clinical_Protocol_Nov2020.pdf