Number and type of pneumococcal infections per year. Pneumococcal disease in Southern Alberta HIV patients over 10 years; there is no evidence of a decreasing trend. The peak in 2007 overlaps with a serotype 5 outbreak among Calgary's homeless community ; number of active patients at the midpoint of each year.
Siemieniuk et al. BMC Infectious Diseases 2011 11:314 doi:10.1186/1471-2334-11-314