id author title date pages extension mime words sentences flesch summary cache txt cord-331465-humpwwk2 Canaday, David H On setting expectations for a SARS-CoV-2 Vaccine 2020-06-04 .txt text/plain 997 67 45 Therefore, the expectation that a SARS-CoV-2 vaccine can develop this level of protection from an immune naive state, especially in the setting of immunizing elderly individuals whose naive B and T cells are substantially diminished, needs to be set with caution. Data from several influenza studies suggest that increased CMI, specifically including both CD4+ and CD8+ T cells, helps mitigate influenza severity in older adults when infected despite vaccination [6] [7] [8] . We should expect all of the existing clinical trial candidates to have incomplete effectiveness, and we need to establish whether those that ineffectively recruit CMI have inferior disease mitigation when COVID-19 develops despite vaccination. Logically, none of the current clinical trials use a live attenuated vaccine, as we simply do not know enough about SARS-CoV-2 virology to safely put forward such a candidate. mRNA vaccines against H10N8 and H7N9 influenza viruses of pandemic potential are immunogenic and well tolerated in healthy adults in phase 1 randomized clinical trials ./cache/cord-331465-humpwwk2.txt ./txt/cord-331465-humpwwk2.txt