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Reportable Diseases in Renfrew County and District

Community Health Status Report Issue #15, 2008, Executive Summary

Reportable Diseases in Renfrew County and District (RCD) provides information on diseases that have been reported to the local Medical Officer of Health in compliance with Ontario’s Health Protection and Promotion Act. This report examines the ten-year period 1998 to 2007, so that any trends over time can be observed. Where possible, information is provided in relation to provincial objectives for disease incidence and immunization coverage that are identified in Mandatory Health Programs and Services Guidelines. (1)

We have provided analysis and comments for the five most common reportable diseases in RCD: chlamydia, hepatitis C, campylobacter enteritis, influenza, and salmonellosis. In addition, we have provided information on hepatitis B, pertussis, and invasive meningococcal disease. The latter three diseases are preventable by routine vaccination, and there have been at least eight cases of each in RC&D during the 2000 to 2007 period.

Summary information on the diseases examined in this report
Disease Percent of all RCD reportable diseases 2000 - 2007 Range in annual number of cases reported in RCD 1998 - 2007 Average annual incidence rate/100,000 population 1998 - 2007
RCD Ontario
Chlamydia 42% 56 - 127 103 166
Hepatitis C 12% 18 - 49 29 42
Campylobacter 12% 16 - 34 25 37
Influenza 9% 5 - 38 15 18
Salmonellosis 8% 11 - 24 17 21
The 3 diseases listed below are less common and are preventable through immunization
Hepatitis B <1% 0 - 11 1.74 1.24
Pertussis <1% 0 - 7 1.62 5.58
Meningococcal disease, invasive <1% 0 - 2 1.0 0.54

Chlamydia

The number of chlamydia cases reported annually in RCD has been increasing. From 1998 to 2004, there were well under 100 cases/year. From 2005 to 2007, there were well over 100 cases/year. Chlamydia incidence rates in Ontario have been rising steadily. Incidence rates in RCD have also been rising, but remain well below Ontario rates.

The highest incidence rates for chlamydia are among young females. In 2007, the incidence rate for females age 15 to 24 was 902 cases/100,000 in RCD and 1,182 cases/100,000 in Ontario. Both rates are well above the provincial objective of 500 cases/100,000 women age 15 to 24.

Hepatitis C

The hepatitis C incidence rate in RC&D has been consistently below the Ontario rate since 1998 except for 2007, when it was higher.

Campylobacter enteritis

The campylobacter enteritis incidence rate in RCD has been below the Ontario rate since 1998 except for 2007, when it was higher.

Salmonellosis

The salmonellosis incidence rate in RC&D has been close to or below the Ontario rate from 1998 to 2007.

Influenza

Annual fluctuations in reported influenza incidence rates in RCD have been similar to fluctuations in Ontario. Mortality rates in RCD for influenza and pneumonia combined were between 12 and 16 deaths/100,000 population (2000 – 2004). These rates are close to those for Ontario as a whole. Since influenza viruses are constantly changing, influenza vaccination is provided on an annual basis.

Local influenza vaccination coverage for people over age 65, residents of long-term care facilities and staff of long-term care facilities has been similar to coverage in Ontario as a whole. However, local vaccination coverage for hospital staff has been consistently lower than in Ontario as a whole and below the provincial objective of 70% for health care workers in contact with high-risk individuals.

Future concerns

It is important to continue with activities directed at the surveillance, prevention, diagnosis, treatment and control of infectious diseases. Future challenges with infectious diseases could include dealing with pandemic influenza, and emerging infectious agents including antibiotic-resistant organisms.

Reference

1 Ontario Ministry of Health. Mandatory Health Programs and Services Guidelines, December 1997. Queen's Printer for Ontario, 1998.