“…However, it was clinically more important than the influenza-negative ILIs because the influenza-positive children more frequently had high-grade and long-lasting fever and long-lasting symptoms, needed further examinations after diagnosis, and received more antipyretic doses. The significant incidence of influenza among children in the community, and its greater seriousness in comparison with other respiratory infections, have been reported by Heikkinen et al 15 and Tsolia et al 16 However, as these studies were carried out at different times and in different countries, our findings confirm that the clinical importance of influenza is constant and largely independent of temporal or geographical factors.…”