Case 60448 is a 33-year-old male Malaysian national who is a WP holder employed by PSA Corporation Ltd as a lashing specialist.
He arrived from Malaysia on 23 December 2020 and served SHN at a dedicated facility until 6 January 2021. His swab test was taken on 3 January during his SHN and his results tested negative for COVID-19.
He is asymptomatic, and was detected when he was tested on 21 February as part of Rostered Routine Testing (RRT). His pooled test result came back positive for COVID-19 the next day. An individual test was done on 23 February, and he was confirmed to have COVID-19 infection on 24 February. He was subsequently conveyed in an ambulance to the National Centre for Infectious Diseases. His earlier tests from RRT – the last being on 13 February – were negative for COVID-19 infection. His serology test result has come back positive but we have assessed that this is likely a current infection.
He received his first dose of the Pfizer-BioNTech COVID-19 vaccine on 22 January, and the second dose on 14 February. This accounts for his positive serology test as he has likely started producing antibodies following vaccination. However as it typically takes a few weeks for an individual to build up immunity after completing vaccination, he was likely to have been infected before he was conferred protection after vaccination.
Source: https://www.moh.gov.sg/news-highlights/details/2-new-cases-of-locally-transmitted-covid-19-infection-25-02-21