Volume 9, Number 5—May 2003
Research
Seasonal Patterns of Invasive Pneumococcal Disease
Figure 4

Figure 4. Weekly rates of invasive pneumococcal disease in children (dotted line; ages 0–17 years), and adults (solid line; age >18 years) in the United States, 1996–1998. Weekly numbers of cases from seven active surveillance areas were divided by the age-specific population and multiplied by 52 to give annualized weekly rates.