A total of 150 children were enrolled in the study including 126 by PSPRN pediatricians and 24 by the research team at Bastyr University. Disposition of study patients is summarized in Figure 1 . Acute nasal swabs for PCR analysis were obtained in 108 patients whose parents thought that their child was developing a cold and had at least one cold symptom. The rest of the analysis is focused on the 108 children in whom an acute nasal swab was obtained. Demographic characteristics for these 108 children are summarized in Table 2 . No differences for any characteristics between children who had an acute nasal swab and those who did not were noted. There were also no statistically significant differences in demographic characteristics between the 108 children in whom acute swabs were obtained and the eight participants who had a "missed" cold.