Updated: 2:29 PM May 10, 2021 The team of testing operatives with the new Covid-19 mobile testing bus for observed lateral flow testing, from left, Martha Ash, Mollie Maddox, Sam Carpenter, and Sam Bailey. - Credit: DENISE BRADLEY/Archant2021 Four buses have been converted into testing units in a bid to further reduce the number of coronavirus cases in Norfolk. Health officials believe the move will help to test those who are asymptomatic and bring the rate of infection down further in the county. Dr Louise Smith, director of public health for Norfolk, said the coronavirus case numbers are coming down but they are plateauing and are not yet down to zero.