In　the　past　three　years,　COVID-19　has　been　threatening　the　world　and　posing　great　challenge　to　the　medical　and　health　system.　Due　to　frequent　and　close　contact　with　high-risk　patients,　pandemic　prevention　and　control　in　hospitals　are　very　important.　Through　the　analysis　of　the　surveillance　video　in　a　hospital　A&E　department　of　Hong　Kong,　behaviors　of　close　contact　and　surface　touch　of　3　patients,　12　doctors　and　12　nurses　were　obtained.　Virus　exposure　via　inhalation　and　deposition　by　close　contact　and　surface　touch　was　analyzed.　The　exposure　risk　by　close　contact　is　much　higher　than　that　of　surface　touch.　In　close　contact,　there　was　no　significant　difference　in　the　infection　risk　between　doctors　and　nurses.　But　the　exposure　risk　of　nurses　was　higher　than　that　of　doctors　via　fomite　transmission.　©　2023　Healthy　Buildings　2023:　Asia　and　Pacific　Rim.　All　rights　reserved.