Limitation
Although this antibody test had provided useful information to our department, there are some limitations to our findings. HEALGEN COVID-19 quoted accuracy of more than 90% in diagnosing RT-PCR positive patients.30 However, it is not authorized for emergency use by the United States Food and Drug Administration.39 It is also not validated on mild to asymptomatic individuals. The serology antibody test is not suitable to detect acute infection due to the nature of the immune response. Thus, staff who were infected within a week may show false-negative results. It is also unknown to many regarding the duration of antibody present in the blood after previous exposure. A positive IgG test may not be protective for future infection and deployment of staff at high-risk area should still be done with the highest degree of infection control.19