Our UHN programs and services are among the most advanced in the world. We have grouped our physicians, staff, services and resources into 10 medical programs to meet the needs of our patients and help us make the most of our resources.
University Health Network is a health care and medical research organization in Toronto, Ontario, Canada. The scope of research and complexity of cases at UHN has made us a national and international source for discovery, education and patient care.
Our 10 medical programs are spread across eight hospital sites – Princess Margaret, Toronto General, Toronto Rehab’s five sites, Toronto Western – as well as our education programs through the Michener Institute of Education at UHN. Learn more about the services, programs and amenities offered at each location.
Maps & Directions
Find out how to get to and around our nine locations — floor plans, parking, public transit, accessibility services, and shuttle information.
Ways You Can Help
Being touched by illness affects us in different ways. Many people want to give back to the community and help others. At UHN, we welcome your contribution and offer different ways you can help so you can find one that suits you.
The Newsroom is the source for media looking for information about UHN or trying to connect with one of our experts for an interview. It’s also the place to find UHN media policies and catch up on our news stories, videos, media releases, podcasts and more.
For many Canadians, warmer weather means more time outside.
But more time outside means more opportunities to be bitten by insects and other creepy crawlers, whether you're enjoying the sun in the city or at the cottage.
In this three-part series, Dr. Jay Keystone, a physician in the tropical disease unit at Toronto General Hospital, UHN, breaks down how to recognize different bites and what you can do to treat them.
Today, he discusses ticks.
Where to find them: Ticks are found across Ontario, most commonly around the southern border of Lake Ontario.
What are the symptoms: Dr. Keystone says ticks are different than all other insects because we can’t feel it when they bite. The only way to know if you’ve been bitten is to find the tick on your skin.
“Ticks actually inject an anesthetic into the bite site which prevents you from knowing they’re even there,” says Dr. Keystone.
“Mosquitoes can bite and take up blood fairly quickly, but ticks have to remain on the body for a period of time to feed. So they don’t want us to knock them off.”
What are the risks: Ticks can carry Lyme disease, which they can transmit through their bites. But not all ticks carry Lyme disease, and Dr. Keystone says if a tick has been on the skin less than 36 hours, you aren’t at risk of contracting the disease.
What you can do: Insect repellants are effective at keeping ticks away. Dr. Keystone also recommends wearing long sleeves and pants when visiting areas where you know there may be ticks, and tucking your pants into your socks.
Dr. Keystone also stresses the importance of tick checks after leaving an area where ticks are common. He recommends checking your whole body, paying particular attention to the hairline, underarms, groin, ankles and behind the knees. He says the tick will look like a small mole.
If you find a tick, carefully remove it using tweezers.
“Do not use your fingers and do not apply anything to the area. You need to grasp the tick right up against the skin, and pull it off in a smooth motion, making sure to remove the tick and its mouth bars,” says Dr. Keystone.
If you find a tick on your skin 36 hours after being exposed, Dr. Keystone says not to panic, but to seek medical attention.
“What we now know is that if you receive a single dose of doxycycline within 72 hours after removal of a tick that has been attached for more than 36 hours, infection can be prevented,” he says.
Public health experts recommend that if ticks are removed they should be placed in a Ziploc bag and sent to the lab for identification.
Want to know more? Revisit parts one and two where Dr. Keystone discusses mosquitoes and flies: