Lyme disease
What is Lyme disease?
Lyme disease is an infection caused by a bacteria transmitted through the bite of an infected tick. In Ontario, Lyme disease is spread by the bite of a black-legged tick, commonly known as a deer tick. Most humans are infected through the bite of an immature tick called a nymph. Nymphs are tiny (less than 2 mm) and difficult to see; they feed during the spring and summer months.
Adult ticks are much larger and are more likely to be discovered and removed before they have had time to transmit the bacteria. Adult blacklegged ticks are most active during late summer and fall.
(More from Ottawa Public Health)
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