SINGAPORE, April 12 — Singapore registered 20 new cases of Covid-19 yesterday, including the first infection in a dormitory since February 28.

The Ministry of Health (MOH) said it is a locally transmitted infection with no links to previous cases.

The remaining 19 cases were imported, and they had already been placed on stay-home notice upon arrival in Singapore.

Giving more details on the dormitory case, MOH said the patient is a 23-year-old male Indian national who holds a work permit.

He is employed by Seafront Support Company as what is known in the marine industry as a lashing specialist.

The man stays in a dormitory located at Brani Terminal Avenue.

He had no symptoms and MOH said this is likely due to him having received both doses of Covid-19 vaccinations, on January 25 and February 17.

He also had a positive serology test as he could have produced antibodies following the vaccination, the ministry added.

"This case is a reminder that it is possible for vaccinated individuals to get infected,” MOH said. "But the vaccine is effective in preventing symptomatic disease for the vast majority of those vaccinated.”

Among the 19 imported cases: