Rapid Covid testing sites tell people with no Covid symptoms if they are infectious or not. Credit: PA Hertfordshire County Council is continuing to expand the number of sites offering free rapid Covid tests for people with no symptoms. Infection rates continue to drop across the county but officials are ramping up the number of lateral flow tests being made available to key workers and other members of the public. To help prevent asymptomatic people passing the virus on unknowingly, the council is setting up numerous pop-up sites, offering rapid tests capable of telling someone whether they have Covid within an hour of taking a test.