viral vector vaccines
... that viral vector vaccines currently in use include four COVID-19 vaccines and two Ebola vaccines?
... that <b id="mwAYI"><a href="./Viral_vector_vaccine" id="mwAYM" rel="mw:WikiLink" title="Viral vector vaccine">viral vector vaccines</a></b> currently in use include four <a href="./COVID-19_vaccine" id="mwAYQ" rel="mw:WikiLink" title="COVID-19 vaccine"><span about="#mwt28" class="nowrap" data-mw='{"parts":[{"template":{"target":{"wt":"nowrap","href":"./Template:Nowrap"},"params":{"1":{"wt":"COVID-19"}},"i":0}}]}' id="mwAYU" typeof="mw:Transclusion">COVID-19</span> vaccines</a> and two <a href="./Ebola_vaccine" id="mwAYY" rel="mw:WikiLink" title="Ebola vaccine">Ebola vaccines</a>?