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.
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PHO Rounds: Respiratory Season 2026–27, Part 2: Overview of Seasonal Respiratory Virus Immunizations in Ontario
The Rounds will review the immunization products available this fall in Ontario, summarize the evidence supporting their use, and highlight new recommendations and changes to the immunization landscape for the 2026–27 respiratory season.
Updated
9 Sep 2025
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