SHANGHAI -- Shanghai reported one locally transmitted confirmed COVID-19 case and four local asymptomatic carriers from midnight to 5 pm Sunday, the municipal health commission said at a press conference.

All five have been sent to designated hospitals for medical treatment and observation, said the health commission, adding that epidemiological investigations were carried out immediately.

As of 4 pm Sunday, 78 close contacts and 180 sub-close contacts of the cases have been traced for quarantine.

The municipal anti-epidemic headquarters said five areas related to the infections have been classified as medium-risk for COVID-19.