Bocavirus load in NPA according to the clinical diagnosis. The median values (horizontal bars) were 4.3 × 103 copies/ml for upper respiratory tract disease (URTD), 4.0 × 104 copies/ml for pneumonia, 7.1 × 104 copies/ml for bronchitis, 1.6 × 108 copies/ml for bronchiolitis, 2.1 × 102 copies/ml for febrile seizures, 9.3 × 102 copies/ml for wheezing bronchitis, and 4 × 103 copies/ml for all NPA. The bocavirus load difference between the NPA of children with bronchitis and febrile seizures was statistically significant as determined by Kruskal-Wallis analysis and Dunn's post test (indicated by superscript a; P = 0.0195).