Results

The patients (n=41) were distributed to the three defined groups of infection: influenza A-H1N1 (n=27), influenza B-H1N1 (n=10), and influenza A-H3N2 (n=4). The mean ages in the three influenza groups were 45.7 ± 14.7, 50 ± 15.03, and 46.6 ± 26.65, respectively. There was no significant difference in mean age between the three groups of influenza subjects (P=0.7). However, the mean age of B-H1N1 patients was slightly higher than that of the influenza A-H1N1 and A-H3N2 patients. Overall, 53.7% (22/41) of the patients were male and 46.3% (19/41) were female. There was no meaningful difference in sex between the three groups of patients (P=0.2). The demographic and clinical information of the subjects is summarized in Table 1.
Based on statistical analysis performed on the serological and clinical manifestations, fever was present in most patients with the various types of influenza, with no significant difference in its rate of presence between the three groups (P=0.58). However, as a considerable finding, the fever temperature was much higher in A-H3N2 subjects (38.9 ± 0.18 °C) than in A-H1N1 (38.18 ± 0.29 °C) and B-H1N1 (38.21 ± 0.26 °C) subjects (P<0.05).
Also, we found a significant difference in the levels of CRP between the three groups of influenza patients (P=0.03). However, no meaningful differences were identified in the WBC count or other serological parameters under study (P>0.05). The serological results of the patients are summarized in Table 2.
In the chest CT scans, patchy infiltration and middle lobe involvement were two parameters that had significantly different rates of occurrence between the three types of influenza strains (P=0.012 and P=0.021, respectively) (Figure 1). The findings seen on all chest CT scans included in this study are summarized in Table 3.