Disease X
... that experts on the World Health Organization's emergency committee believe that COVID-19 could be the first Disease X?
... that experts on the <a href="./World_Health_Organization" id="mwBo4" rel="mw:WikiLink" title="World Health Organization">World Health Organization</a>'s emergency committee believe that <a class="mw-redirect" href="./Coronavirus_disease_2019" id="mwBo8" rel="mw:WikiLink" title="Coronavirus disease 2019"><span about="#mwt75" class="nowrap" data-mw='{"parts":[{"template":{"target":{"wt":"nowrap","href":"./Template:Nowrap"},"params":{"1":{"wt":"COVID-19"}},"i":0}}]}' id="mwBpA" typeof="mw:Transclusion">COVID-19</span></a> could be the first <b id="mwBpE"><a href="./Disease_X" id="mwBpI" rel="mw:WikiLink" title="Disease X">Disease X</a></b>?