Invasive Meningococcal Disease
Reported cases and incidence (per 100,000) of invasive meningococcal disease in Canada, 1985 to 2010*.
In Canada, the annual number of invasive meningococcal disease cases increased from 111 to 447 cases between 1985 and 1990. The number of cases then decreased down to 264 in 1996. Cases then increased again to a peak of 366 in 2001. Since 2002, case numbers have remained relatively stable, ranging between 154 and 234.
In Canada, the annual incidence of invasive meningococcal disease increased from 0.43 to 1.61 cases per 100,000 population between 1985 and 1990. The incidence then decreased down to 0.89 cases per 100,000 in 1996. Incidence then increased again to a peak of 1.18 per 100,000 in 2001. Since 2002, incidence has remained relatively stable, ranging between 0.45 and 0.75 cases per 100,000.
*Case data obtained from the National Enhanced Invasive Meningococcal Disease Surveillance System. Population data obtained from Statistics Canada July 1st annual estimates. Data for 2007 to 2010 are preliminary.
Incidence of invasive meningococcal disease per 100,000 population in Canada by serogroup and year, 1995 to 2010*.
In Canada, the annual incidence of invasive meningococcal disease serogroup B has remained fairly steady between 1995 to 2010, ranging from 0.22 to 0.44 cases per 100,000 population. The annual incidence of invasive meningococcal disease serogroup C decreased from 1995 to 1998 from about 0.35 to 0.13 cases per 100,000 population. It then increased to a high of 0.60 in 2001. Since then, it has decreased down to a low of 0.03 in 2010. The annual incidence of invasive meningococcal disease serogroup W-135 has remained fairly steady between 1995 to 2010, ranging from 0.01 to 0.05 cases per 100,000 population. The annual incidence of invasive meningococcal disease serogroup Y has remained fairly steady between 1995 to 2010, ranging from 0.06 to 0.13 cases per 100,000 population. The annual incidence of invasive meningococcal disease due to other serogroups has been relatively rare between 1995 to 2010, ranging from 0.00 to 0.02 cases per 100,000 population. The annual incidence of non-groupable invasive meningococcal disease has been relatively rare between 1995 to 2010, ranging from 0.00 to 0.06 cases per 100,000 population. The annual incidence of invasive meningococcal disease whose serogroup was unknown has decreased from a high of 0.16 cases per 100,000 to a low of 0.01 in 2004. Since then it has been relatively stable at about 0.03 cases per 100,000 population.
*Case data obtained from the National Enhanced Invasive Meningococcal Disease Surveillance System. Population data obtained from Statistics Canada July 1st annual estimates. Data for 2007 to 2010 are preliminary.