CRP and COVID-19: In the pre-COVID-19 period (n = 503), children in the antibiotic group were significantly older (p < 0.001) and more frequently presented with fever (p < 0.001) and diarrhea (p = 0.037) as well as higher neutrophil counts (p < 0.001) and CRP levels (p < 0.001), compared with the non-antibiotic group (Table S1).