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Lyme Disease & Ticks
- A serious tick-borne disease -
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Summary: Certain hard ticks carry a serious disease called Lyme Disease. Learn how to avoid tick bites and how to properly remove a tick that has attached to you or your pets.
Jack DeAngelis, PhD
OSU Ext. Entomologist (ret.)
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 Lyme Disease (Lyme borreliosis) is caused by a bacterium (Borrelia burgdorferi) that may be transmitted when certain ticks in the genus Ixodes [more pictures] bite. The name "Lyme" comes from the town in Connecticut, USA where it was first found in the US. The disease was originally described in Germany in the late 1800's.
Ticks that carry Lyme Disease
Two tick species are primarily responsible for transmission of the Lyme Disease pathogen to humans in North America. One is common throughout the central and eastern US [picture of Ixodes scapularis] and the other is common along the Pacific coast and in other western states (right). Both feed on mammals, birds, and lizards as well as humans.
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Western black-legged tick, Ixodes pacificus. Transmits Lyme disease in western US. Photo is black and white, actual coloration is red and black.
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Ticks acquire the microorganisms that cause Lyme Disease when they feed on an infected animal such as a mouse or deer. When infected ticks feed they may transfer these organisms to the next host. Some reports indicate that ticks must be attached and feeding for at least 24 hours before disease transmission is likely to occur. This is why prompt removal of ticks is so important.
common misspellings: lime disease
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Animal reservoirs of Lyme Disease
An animal reservoir is the species in which a disease organism, in this case the Lyme Disease spirochete, resides and serves as the source of the pathogen. For example, rodents are the animal reservoir for the Plague bacterium and fleas spread the Plague between rodents and humans.
Increased incidence of Lyme Disease in central and eastern states in the US may be related to the increased abundance of white-tailed deer, and ticks, and their proximity to housing developments. Mice, and the ticks that live on them, are also suspects in transmission of Lyme Disease.
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What to do about tick bites
Remove ticks immediately when found. Also, use repellents during summer if your activity takes you into tick habitat. Check yourself and pets carefully for ticks after visiting areas with tall grass or brush. If a "bulls-eye" rash develops around the tick bite seek medical attention immediately. Lyme Disease is highly treatable with antibiotics when detected early -- early detection is the key.
Hikers, hunters and others who spend time outdoors should have a copy of: Ticks and What You Can Do About Them by Roger Drummond (more information ).
Are pets susceptible to Lyme Disease?
Yes. Both dogs and cats can get Lyme Disease from tick bites. Pets should be protected with regular treatments of flea and tick medications and prompt removal of ticks when found.
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The Pest Management Store
Identification guides, reference and gardening books, etc.
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