They could be vegetable vendors, grocery and milk shop owners, petrol pump attendants or garbage collectors, who by the nature of their job carry the risk of contracting and spreading the viral infection Ahmedabad: At least 700 "super spreaders" were found coronavirus positive in Ahmedabad in a massive screening of vegetable sellers and shopkeepers conducted in a week after officials had ordered closure of shops, except those selling milk and medicines, between May 7 and 14, a senior bureaucrat said on Saturday. "Super-spreaders" are potential carriers of the viral infection who could infect a large number of people coming in their contact.