SINGAPORE - There were 12 imported cases of the coronavirus reported on Sunday (March 21) - four of whom are sea crew arriving from Indonesia on one vessel.

They were tested onboard without disembarking, said the Ministry of Health (MOH).

The new cases bring Singapore's total number of infections to 60,196.

All 12 cases had already been placed on stay-home notice or isolated upon arrival in Singapore, said MOH.

Besides the four sea crew - who are special pass holders - the cases comprised one Singaporean, one dependant's pass holder, two long-term visit pass holders, one work pass holder, and three work permit holders.

The Singaporean is a 23-year-old man who returned from India.

The dependant's pass holder arrived from Nepal, while the two long-term visit pass holders came from India.

The sole work pass holder came from Nepal. The three work permit holders who arrived from India, Indonesia and the Philippines are all foreign domestic workers.

There were no community cases reported on Sunday.

Overall, the number of new cases in the community has decreased from two in the week before to none in the past week.

The number of unlinked cases in the community also dropped from two in the week before to none in the past week.

Among the 91 confirmed cases reported from March 15 to Sunday (March 21), 34 cases had positive serology tests, indicating a past infection.

Another 36 tested negative in the serology tests, and 21 results are still pending.

Meanwhile, MOH noted that one cluster remains open, with cases linked to a 41-year-old female Singaporean who is a Singapore Airlines cabin crew member. She was confirmed to have Covid-19 infection on Feb 8. The other cases are her spouse and domestic helper.

With 16 patients discharged on Sunday, 60,023 have fully recovered from the disease.

A total of 18 patients remain in hospital. Of these, most are stable or improving and none is in the intensive care unit, MOH said.

Another 110 are recuperating at community facilities. These are those who have mild symptoms, or are clinically well but had tested positive for Covid-19.

Singapore has had 30 deaths from Covid-19 complications, while 15 who tested positive have died of other causes.

Globally, the virus outbreak, which began in December 2019, has infected more than 122 million people. More than 2.7 million have died.