From the AirPath point of view, to carry out an exposure assessment -that is, to estimate and measure the amount of infectious pathogens entering our bodies through inhalation -is already a complex and multidisciplinary science without the added component of using exposure data and disease outcomes to predict risk factors. We think that Air-Path has contributed towards forming a technical network, as shown in the output in Table 1 , as well as a medical network to further clarify a comprehensive and systematic exposure assessment. 