The move is being taken beginning Thursday in order to prevent the spread of the virus and to investigate the matter.
The virus remains a major concern on the world stage since its outbreak in the Chinese city of Wuhan in December.
They said the medical conditions of 11,977 people diagnosed with the virus are serious.
The number of those under medical observation has dropped to 135,881, while the number of patients who have been treated and discharged has risen to 14,376.
The coronavirus, now officially known as COVID-19, is said to have been transmitted to humans from animals, particularly bats.