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Attention - New Registration and Login System

PHO has implemented a new registration and login system.

  1. Click here to re-register
  2. Click “create one” next to “No account?”.
  3. Enter the same email address previously associated with your account.
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  5. Enter the security code and follow the prompts.

If you have trouble re-registering, please read our Frequently Asked Questions or contact: webmaster@oahpp.ca.

Please note this does not impact PHO’s online Water Testing Portal.

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Diseases & Conditions
Index Infectious Diseases Sexually Transmitted Infections (STIs)
Syphilis

Syphilis

Syphilis is a sexually transmitted infection caused by Treponema pallidum. It is transmitted through vaginal, anal or oral sex and can also be transmitted from infected mother to infant during pregnancy or birth. Early symptoms can include genital sores, rash and headache. Untreated, syphilis can eventually affect the brain and nervous system. Prenatal testing and condom use can reduce risk of spread.

Featured

Evidence Brief

This evidence brief presents the available evidence on public health approaches to the case and contact management of women and/or pregnant people with syphilis.

1 MB
Published 9 Sep 2025

Summary Report

This report describes the epidemiology of infectious syphilis and early congenital syphilis in Ontario with a focus on cases reported in 2023, including incidence by age, sex, geography, and testing.

1.8 MB
Updated 7 Jan 2025

Evidence Brief

Summary of the evidence on universal prenatal syphilis screening during third trimester and/or delivery as a strategy to prevent congenital syphilis.

372 KB
Published 24 Nov 2023

 

Event

PHO Rounds: Toxigenic C. Diphtheriae in a Donkey: Implications for Zoonotic Disease Transmission and One Health Approach

Enhanced disease surveillance, along with clearer protocols for reporting and information sharing across sectors, is essential to reduce the risk of future zoonotic outbreaks and protect public health.

See the Event Details

Related Information

External Resources

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Contact the Department

Communicable Disease Control

Communicable.DiseaseControl@oahpp.ca

contact lab

Contact Laboratory Customer Service

Microbiology and Laboratory Services

customerservicecentre@oahpp.ca

Updated 9 Sep 2025
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