Health Officials Warn of Rising Tick-Borne Disease Risks in US and Canada

Health officials in Maryland and Ontario are urging the public to take precautions against tick-borne diseases while spending time outdoors [1, 2].

These warnings come as environmental shifts make black-legged ticks more prevalent in grassy and wooded areas. The intersection of warming weather and increased outdoor activity has raised the risk of infection for residents in these regions [1, 2].

In the Simcoe Muskoka region of Ontario, the District Health Unit issued guidance on May 21, 2026 ^[1]. Officials said that simple steps can prevent the transmission of illnesses carried by ticks. The guidance focuses on the necessity of staying vigilant in areas where ticks are known to thrive, particularly in dense vegetation.

Similarly, the Maryland Department of Health launched a public health campaign in early May 2026 ^[2]. The campaign aims to educate residents on how to guard against tick-borne diseases as the spring season progresses. Maryland officials said they are focusing on community outreach to ensure the public recognizes the signs of tick exposure and knows how to respond.

Climate change is cited as a primary driver for the increased presence of black-legged ticks [1, 2]. Warmer temperatures allow these parasites to expand their habitats and remain active for longer periods throughout the year. This shift creates a higher probability of human-tick encounters in areas that were previously less affected.

Health departments recommend wearing protective clothing and using repellent when entering wooded or grassy areas. They also advise performing thorough tick checks on the body, and clothing, immediately after returning indoors [1, 2]. Early detection and removal of ticks are critical to reducing the risk of severe illness.