At least 16 people, who were high-risk contacts of a Covid-19 positive pizza delivery boy in Delhi, tested negative for the virus, said South Delhi District Magistrate Brij Mishra on Monday.More than 72 families had been quarantined after the pizza delivery agent from the national capital tested positive for Covid-19.Along with the families, there were at least 17 colleagues of the delivery agent who were also placed under quarantine. Watch the video for more information.