Lyme Disease in Ohio:
Lyme disease has been increasing steadily in Ohio in recent years. Current estimates that track the incidence of Lyme in Ohio are reporting 2,800- 3,500 cases per year, or a moderate risk. Previously, Lyme disease was not thought to be a large problem in Ohio. It was not understood exactly as to why many border states would report large numbers of Lyme disease, while Ohio numbers would remain relatively low. Ohio does have a good climate for harboring Ixodes scapularis (the black legged tick), one of the carriers of Lyme disease. Surveillance agencies with the Ohio Department of Health are noting an increase in black legged tick populations over sixty times higher than in previous years. As the black legged tick populations increase in Ohio, there is great potential to see an increase in the number of Lyme disease cases.
The Black Legged Tick
In the spring time, black legged ticks transmit infection to feeding larvae and nymphs (immature ticks). These larvae primarily infect rodents and small mammals, whereas adult ticks will infect deer and other large mammals. Nymphs and adult ticks will normally infect humans and pet dogs. After the tick attaches, the spirochete bacteria that cause Lyme disease enter the dog’s body spreading to many different areas. Lyme disease bacteria can spread to the joints, connective tissue, heart, and kidneys. A few weeks after infection, the bacteria is present only in very small quantities in the tissue, but it is the immune system’s response to the infection that causes the majority of symptoms. Usually, illness begins 2-3 months after the tick has attached. Symptoms may include loss of appetite, fever, swollen lymph nodes, increased drinking or urination. Lameness may also be present in one or more limbs. Lyme disease is treated with one or more courses of common antibiotics, such as doxycycline. There is a simple in house test made by Idexx that can detect if your pet has been exposed to Lyme disease. If pets have clinical signs and a positive test for Lyme disease, the treatment is inexpensive and very safe. Lyme disease may cause long term sequela including chronic arthritis and chronic kidney disease. The organism may be difficult to get rid of completely and this can cause disease relapse. In people, Lyme disease causes a characteristic “target lesion” rash on the skin. While very common in humans, the target lesion is present in less than 30% of affected dogs. Absence of a target lesion where the tick was attached does not mean that a pet is not infected with Lyme disease.
There are several important measures of prevention for your pet:
• First, there is a vaccine available in dogs which protects against Lyme disease. Specialists are now recommending that dogs who spend time outdoors in Ohio on a regular basis should have this vaccine annually.
• Second, have your pet on a monthly tick prevention product. The tick must be attached for at least forty-eight hours in order to spread the spirochete bacteria that cause Lyme disease. Vectra, Revolution, Certifect, and Advantix are all tick prevention products that will cause the tick to detach in less than 48 hours, thus preventing the spread of the bacteria.
• For an updated map on the prevalence of Lyme disease in different areas, please check out: http://www.dogsandticks.com/diseases_in_your_area.php
These simple preventative measures will protect you and your pet from Lyme disease. Enjoy your spring!
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