South Korean health authorities raised new concerns about Covid-19 after reporting last month that dozens of patients who had recovered from the illness later tested positive again.<br /><br />Even though experts say the results were ''false positives'', the revelation threatened to complicate efforts to lift quarantine restrictions and to produce a vaccine.<br /><br />WATCH MORE: https://thestartv.com/c/news<br />SUBSCRIBE: https://cutt.ly/TheStar<br />LIKE: https://fb.com/TheStarOnline
