LAUSR

To the Editor — Healthcare personal (HCP) are frontline workers in the coronavirus disease 2019 (COVID-19) pandemic, and they are at high risk of COVID-19. Risk factors for hospital-acquired COVID-19 among HCP include prolonged periods of patient care, performing aerosol-generating procedures, lack of adequate personal protective equipment (PPE), and inadequate compliance to infection prevention and control (IPC) policies. 1,2 HCP can also acquire severe acute respiratory coronavirus virus 2 (SARS-CoV-2) from high-risk contact with other HCP with COVID-19 (eg, eating together) and via community and household exposures. Thus, the level of HCP awareness of and adherence to hospital IPC policy is crucial in preventing hospital-acquired COVID-19. To evaluate factors associated with COVID-19 among HCP with high-risk exposures, we compared the type of exposure, use of PPE, and compliance with the hospital IPC policy among exposed HCP who did and did not acquire COVID-19. From January 1 to December 31, 2021, a case – control study (1 case per 2 controls) was conducted to investigate risk factors associated with COVID-19 among HCP with high-risk exposures at Thammasat Hospital, Thailand. A case was defined as an HCP with a high-risk exposure to a patient or HCP with COVID-19 and who subsequently had reverse-transcription polymerase