There are few reports of confirmed cases who are truly asymptomatic, and to date, there has been no documented asymptomatic transmission (WTO 9/7/20). This aside, the VTi works in line with any other temperature reading equipment that would also not be able to identify an asymptomatic person. It will always be an advantage to identify the changing temperature for people that are not asymptomatic and that is most of us. Anyone one of us could encounter an asymptomatic person going about our daily lives. It is going to be part of life from now on, but if transmission of an illness did take place early intervention is key.