Figure 1. Cases of invasive group A streptococcal infection in Middlesex-London, Ontario, by month of onset (January 1, 2015–February 28, 2018)^a.

^a Includes cases reported up to March 20, 2018

Legend: Green bars denote cases included in the outbreak investigation (from April 1, 2016, onwards). Grey bars denote cases with an onset date prior to the outbreak