Figure 1.

Timing of influenza and other respiratory virus detections in 115 participants aged 6–15 years (A–D), compared with local influenza surveillance data (E). Solid red bars indicate detections in 69 participants who received 2008–2009 trivalent inactivated influenza vaccine, and black dashed bars indicate detections in 46 participants who received placebo. The bottom panel shows local laboratory surveillance data on the proportion of influenza virus detections among specimens submitted to the Public Health Laboratory Service (PHLS). Less than 2% of PHLS specimens were positive for influenza B throughout the year. “Other viruses” included coronavirus, human metapneumovirus, parainfluenza, and respiratory syncytial virus.