IFNG and susceptibility to pneumonia measurement: Even in young adults, IFN-γ is found elevated in the case of URTIs compared to minor infections [83], but interestingly, in young adults, higher values of IFN-γ are found in hypoxemic HAdV 55 infections, compared to non-hypoxemic cases, and are similarly found in cases of severe HAdV 55 pneumonia [84].