Figure 9.4.3: Pertussis by year
Rate of pertussis infections reported per 100,000 population, Middlesex-London and Ontario, 2005 to 2018
Between 2005 and 2018, the rate of pertussis infections among both Middlesex-London and Ontario residents fluctuated, although the provincial rate generally declined.
Across the 14-year time period, the local rate was significantly lower than the provincial rate in seven years, however, since 2015 the Middlesex-London rate has been comparable to the rate for Ontario as a whole.
In both Middlesex-London and Ontario, 2012 was characterized by a noticeable increase in the rate of pertussis infections. This increase was associated with a widespread pertussis outbreak that began in an under-immunized community in southwestern Ontario and subsequently spread to residents of several other public health jurisdictions.