The workflow of COVID-19 antibody surveillance test among healthcare workers in SHC (Figure 1 and Figure 2)
Healthcare workers who fulfill the person under investigation (PUI) criteria will be directed to occupational health and safety officers in our hospital and further assessed by local infection disease specialist following the PUI protocol of Malaysia.28 The Malaysian Ministry of Health PUI criteria29 is acute respiratory infection with or without fever and history of traveling to foreign countries, close contact, or attended an event associated with COVID-19 outbreak. Participants who were asymptomatic or with the onset of clinical symptoms for at least seven days before the survey received the antibody serology blood test. Other participants who are having symptoms for less than seven days during the survey will be tested after the symptoms had resolved seven days from the onset of illness. Staff with a positive surveillance antibody serology test, either IgM or IgG, will be referred to occupational health officer and later, the infectious disease specialist for further assessment and RT-PCR test.