Ehrlichiosis is a tick-borne disease that can cause an acute infection that begins with a fever, loss of appetite and lethargy.
Ticks are a problem! We all know they spread the bacteria that causes Lyme disease, but another tick-borne disease that is steadily increasing is ehrlichiosis.
 |
| This Scary Disease From Ticks Is on the Rise |
Dogs with ehrlichiosis can develop an acute infection that begins with fever, loss of appetite and lethargy. Two to four weeks after experiencing the bite of an infected tick, a subclinical infection can start, causing thrombocytopenia. And the dog lacks enough platelets in his blood. When that happens, he can experience bleeding into body tissues (known as pinpoint hemorrhages 'petechiae') and bruising. His blood may clot more slowly than normal after an injury. Bone marrow suppression can result from chronic Ehrlichia spp. (the "spp." refers to all species of this type of bacteria) infection. It can appear months to years after a tick bite.
This disease in Cats may also show similar signs. Other signs seen in cats and dogs include vomiting, diarrhea, weight loss and joint pain.
How It’s Spread
Three tick species are known to spread the organism that causes ehrlichiosis. The brown dog tick (Rhipicephalus sanguineus), found throughout the United States, is the primary culprit, but the American dog tick (Dermacentor variabilis) and the lone star tick (Amblyomma americanum) can also transmit the bacteria that cause disease. You might think lone star ticks would be limited to the Lone Star State (Texas, of course), but they are found up from the southeastern U.S. and Texas through the Mid-Atlantic Seaboard all the way to New England. American dog ticks reside east of the Rockies, mainly in areas such as grassy fields, walkways and trails. They can survive for two or more years without a host.
Dogs (and cats) become infected with Ehrlichia spp. when infected ticks feed on them, injecting the bacteria into their blood by deeply burying their mouthparts into the skin. Nasty!
It can take as little as three to six hours for ticks to transmit the bacterial invaders. Once the bacteria enter the blood cells, they thrive, multiply and spread throughout the body. The disease is diagnosed based on a history of tick exposure, presence of signs, a platelet count and a positive blood test result for the bacteria that cause the disease: Ehrlichia canis (the primary cause in dogs), Ehrlichia ewingii (seen in dogs and humans) and Ehrlichia chaffeensis (the primary cause in humans). Ehrlichiosis isn’t always easy to diagnose, because it can take time for antibodies to develop, but response to treatment with antibiotics can be a clue that your veterinarian has found the cause of your dog’s signs.