According to the dose-response relationship  and assuming the same dose-response parameters, the fomite route with a higher exposure dose should be more important than the airborne route. Lei et al.  investigated the relative contributions of norovirus transmission routes in a flight norovirus outbreak, and predicted contributions of 96% and 4% for the fomite and airborne routes, respectively. Therefore, the contribution of the airborne route to norovirus transmission might be negligible when compared with the fomite route, and increased effort should be invested into controlling the transmission of fomite contamination.