First probable case of new tick-borne illness identified in region

A probable case of anaplasmosis (human granulocytic anaplasmosis) has been declared by Hastings Prince Edward Public Health (HPEPH) in the region.

Anaplasmosis is caused by a type of bacteria transmitted to humans by the bite of a blacklegged tick, the same kind of tick that transmits Lyme disease.

HPEPH states this is the first probable case of anaplasmosis identified in the region since the disease was identified as a reportable disease of public health significance in Ontario on July 1, 2023. A case is considered probable when an individual has compatible signs and symptoms of the disease and is likely to have had exposure to the disease.

Public health states that for most people, anaplasmosis is a mild illness. Symptoms usually resolve within 30 days, even without treatment; however, it can be more severe in certain individuals. Those at greater risk for severe illness include older individuals and those who have a weakened immune system. A delay in diagnosis and treatment may also result in more severe illness.

An individual might be at risk of anaplasmosis if they are bitten by a blacklegged tick carrying the Anaplasma phagocytophilum bacterium, and the tick is attached for at least 12 hours.

The first symptoms of anaplasmosis usually appear within one to two weeks after being bitten by an infected tick. Symptoms can include:
Fever and chills, severe headache, muscle aches, nausea, vomiting, diarrhea, loss of appetite.

People who are experiencing the symptoms and have recently been bitten by a tick, or been in a tick habitat, are to contact a health care provider.