Anaplasmosis rise in Canada

Anaplasmosis, the second most common tick-borne disease in Canada, is rising as blacklegged ticks expand into new provinces. A case report published July 13, 2026 in the Canadian Medical Association describes a 79-year-old man from eastern Canada — Ontario who developed myocarditis as a complication. The patient recovered after doxycycline treatment. Canada — Public Health Agency of Canada and United States — United States Public Health Service Commissioned Corps report increasing incidence, with cases primarily in Canada — Ontario and increases in Canada — Quebec and Canada — Manitoba. Climate change is contributing to tick population expansion.