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Infectious Diseases

Infectious diseases are caused by pathogenic microorganisms, such as bacteria, viruses, parasites or fungi. These diseases can be acquired from another person, through fluid exchange or exposure to vectors, or from the environment. Public Health Ontario provides public health and health care partners with information, tools, and resources for the prevention and control of infectious diseases including:

  • infectious disease surveillance, epidemiology, and data analysis and reporting
  • case, contact and outbreak investigation and management
  • prevention, control advice and support
  • education and training
  • laboratory testing
  • consultation

Areas of expertise include immunization and vaccine-preventable diseases; enteric, zoonotic and vector-borne diseases; and a wide range of infection prevention and control programs for health care  and  long-term care settings. 

Vector-Borne Diseases
Summary Report

tick on a blade of grass


This report summarizes the 2016 data on the vectors that transmit West Nile Virus (WNV), eastern equine encephalitis virus (EEEV) and Lyme disease in Ontario.

Open the report

Management of patients with suspected rabies exposure



This guidance document provides information to support health care providers to work with local public health units to appropriately manage persons with suspected rabies exposures.

Echinococcus multilocularis (tapeworm)



These documents highlight key information about echinococcus multicularis:




Infectious Disease Snapshots


Provides access to statistics and information related to reportable infectious disease for Ontario and its 36 public health units.

Go to the Snapshots web page

Surveillance Reports


This set of routine and annual reports provide data and trends related to different infectious diseases, antimicrobial resistance and immunization.

View all Surveillance Reports

Reportable Disease Trends

Photo of wine on a store shelf 

This interactive tool provides data from the last ten years and allows you to search, customize and export your results.

View Reportable Disease Trends in Ontario

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​Contact us

Know who to contact, by disease:
Reportable disease contact list

Page last reviewed:  
Page last updated: 2017-11-21 10:50 AM
Uncontrolled print copy. Valid only on day of Print: [date]
Page updated on [date/time] 2017-11-21 10:50 AM
© , Ontario Agency for Health Protection and Promotion