LEP and susceptibility to pneumonia measurement: In subgroups with lower blood oxygenation levels (<95%), primary high GGTP (GGTP activity > 50 U/L), alimentary symptoms [%] (diarrhea—22.5%, vomiting/nausea—25.0%, abdominal pain—2.5%, dysgeusia—5.0%), and respiratory symptoms [%] (cough 25.0%, dyspnea 5.0%, pneumonia 27.5%), we did not find any statistically significant differences in visfatin and leptin serum concentrations, as presented in Figure 3 and Table 1, Table 2, Table 3 and Table 4.