Shanghai has divided the whole city into areas belonging to three categories as part of targeted efforts to overcome a local COVID-19 resurgence.It has designated 7,624 closed-off management areas, 2,460 restrictive control areas and 7,565 prevention areas, according to a press conference held on Monday.The closed-off management areas refer to residential communities, villages, work units, or venues with COVID-19 infections reported in the past seven days. People in these areas will undergo seven days of closed-off management plus seven days of health monitoring at home. Door-to-door services will be provided where needed.