Table 1

Demographic and clinical characteristics of patients with viral infections

CharacteristicAll viruses (n=101)Influenza (n=29)RSV (n=54)Other viruses (n=18)
Age (days)
Male:female ratio1.241.401.161.25
Background illness (%)22.813.825.916.7
Exposure (%)38.669.0‡20.444.4
Serious bacterial illness (%)7.9210.35.5611.1
Fever >38.0°C (%)63.496.5‡46.391.6
Fever °C (median)38.738.738.538.8
URT signs (%)94.182.8*96.383.3
Respiratory distress (%)64.524.1‡88.955.6
Infiltrate on CXR (positive/total)20/691/13§17/442/12
Hyperinflation (positive/total)29/694/1320/445/12
Hypoxia %50.510.3‡77.833.3
CNS (%)17.824.19.265.56
Median fever duration (days)21.521
Median hospitalisation (days)54†64.5
PICU (%)
Intubation/bronchoscopy (%)5.005.611.1
  • Exposure, history of exposure to a family member with upper respiratory symptoms.

  • * p≤0.05, influenza versus RSV, χ2, two-tailed. †p<0.001, influenza versus RSV, Mann–Whitney rank sum test. ‡p≤0.001, influenza versus RSV, χ2, two-tailed. §p=0.044, Fisher's exact test, two-tailed.

  • CNS, central nervous system manifestations (sleepiness or excessive irritability); CXR, chest x-ray; PICU, paediatric intensive care unit; URT, upper respiratory tract.