In children aged 1–5 years, not having a family member affected by COVID-19 (B = −1.38, 95% confidence interval [CI] −2.43, −0.34, p = 0.011), having pneumonia on chest X-ray (B = 0.81, 95%CI 0.34, 1.29, p = 0.002), being a boy (B = −0.65, 95%CI −1.17, −0.13, p = 0.018), and having higher C-reactive protein (CRP) values on admission (B = 0.12, 95%CI 0.07, 0.17, p = 0.001) were associated with the administration of a higher number of antibiotics. This evidence concerns the gene CRP and susceptibility to pneumonia measurement.