(FILES) In this file photo taken on March 06, 2020 Britain's Prime Minister Boris Johnson washes his hands during a visit to the Mologic Laboratory in the Bedford technology Park, north of London on March 6, 2020. - Britain's Prime Minister Boris Johnson has tested positive for the new coronavirus COVID-19 and is self-isolating in 10 Downing Street, it was announced on March 27, 2020. Johnson experienced "mild symptoms" on March 26 and was tested at Number 10 by NHS staff, a statement said. (Photo by Jack Hill / POOL / AFP)