[[COVID-19]] has reportedly caused increased blood clotting, which can cause strokes or heart attacks.<ref>https://www.inquirer.com/health/coronavirus/covid19-stroke-blood-clots-prevent-blood-thinners-virtua-troy-randle-trial-pitt-20210104.html</ref> A participant in one of the [[vaccine]] trials also suffered an unexpected heart attack at age 70, and died. | [[COVID-19]] has reportedly caused increased blood clotting, which can cause strokes or heart attacks.<ref>https://www.inquirer.com/health/coronavirus/covid19-stroke-blood-clots-prevent-blood-thinners-virtua-troy-randle-trial-pitt-20210104.html</ref> A participant in one of the [[vaccine]] trials also suffered an unexpected heart attack at age 70, and died. |