1. Centers for Disease Control and Prevention Active Bacterial Core Surveillances. ABCs report: Streptococcus pneumoniae, 2014. 2016. Available at http://www.cdc.gov/abcs/reports-findings/survreports/spneu14.html . Accessed 19 June 2016.
2. Public Health Agency of Canada. Immunization and vaccines. Invasive pneumococcal disease. 2016. Available at http://www.phac-aspc.gc.ca/im/vpd-mev/pneumococcal-pneumococcie/professionals-professionnels-eng.php . Accessed 19 June 2016.
3. Davis SM, Deloria-Knoll M, Kassa HT, O’Brien KL. Impact of pneumococcal conjugate vaccines on nasopharyngeal carriage and invasive disease among unvaccinated people: review of evidence on indirect effects. Vaccine. 2013;32(1):133–45.
4. Bigham M, Patrick DM, Bryce E, Champagne S, Shaw C, Wu W, et al. Epidemiology, antibiotic susceptibility, and serotype distribution of Streptococcus pneumoniae associated with invasive pneumococcal disease in British Columbia- a call to strengthen public health pneumococcal immunization programs. Can J Infec Dis Med Microbiol. 2003;14(5):261–6.
5. Boikos C, Quach C. Risk of invasive pneumococcal disease in children and adults with asthma: a systematic review. Vaccine. 2013;31(42):4820–6.