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As a result of vital sequence homology between SARS-CoV-2 Things I Do In My Spare Time Books Shirt and SARS-CoV (the unique SARS virus): the potential for antibody-dependent enhancement (ADE) and the Happy Liberate Ohio Resist Tyranny Shirt potential for vaccine-associated enhanced respiratory illness (VAERD)41,50. One other potential possibility for measuring population-level vaccine safety towards COVID-19, when a licensed vaccine is obtainable, is the cluster-randomized effectiveness trial (CRTs), by which some clusters of people are randomized to obtain the research vaccine in a means that simulates public well being follow, whereas different clusters of people are randomized to not obtain the vaccine, resembling that from a CRT of typhoid polysaccharide vaccine in Kolkata66.