Multivariate analysis only showed significant association of serum IL-6 with pneumonia at days 9, 11, 13 (OR = 31.1, p = 0.019, 95% CI = 1.8–548.3 at day 9; OR = 1548.8, p = 0.019, 95% CI = 1.5–1570483 at day 11; and OR = 45.4, p = 0.016, 95% CI = 2.0–1021.8 at day 13) and no association with other infections (see also Table S1). This evidence concerns the gene IL6 and susceptibility to pneumonia measurement.