CRP and coinfection: In the 2014 epidemic, the risk of hospitalization was significantly increased in patients with co-infections (OR = 5.944, p = 0.011), bronchiolitis/ bronchopneumonia (OR = 2.505, p = 0.024), underlying disease (OR = 18.187, p < 0.001), diarrhea (OR = 2.056, p = 0.037), vomiting (OR = 2.413, p = 0.003), increased WBC counts (OR = 1.00006, p = 0.018) and increased CRP values (OR = 1.007, p = 0.007).