<p style="text-align:start;" size="0" _root="undefined" __ownerid="undefined" __hash="undefined" __altered="false">Queen Elizabeth II of the U.K., 95, tested positive for Covid-19 Sunday, Buckingham Palace announced Sunday, and while her prognosis remains much better because of the development of vaccines (the queen has received at least one dose) and effective covid treatments, her advanced age puts her at particular risk. </p><h2 style="text-align:start;text-indent:2em;"></h2>