A third "booster" shot of the Oxford-AstraZeneca COVID-19 vaccine produces a strong immune response, researchers said on Monday (June 28), adding there was not evidence that such shots were necessary in light of shortages in some countries. <br /><br />WATCH MORE: https://thestartv.com/c/news<br />SUBSCRIBE: https://cutt.ly/TheStar<br />LIKE: https://fb.com/TheStarOnline
