• Definition

    Ehrlichiosis is an infection passed through a tick bite. It can be treated with medication but can be fatal if not treated.
  • Causes

    Ehrlichiosis is cause by specific bacteria. The bacteria are passed through the bite of a tick, specifically the lonestar, deer, and dog ticks.
  • Risk Factors

    Spending time in an area where ticks are common, increase your risk of infection. This includes outdoor areas with high grass or bushes. Not all tick bites will lead to infections.
    The infection is most often found in the mid-Atlantic, southeastern, and south central United States.
    The risk of a severe infection is increased in people with impaired immune systems such as HIV or cancer.
  • Symptoms

    It may take at least 1-2 weeks before symptoms develop. The first symptoms are often flu-like symptoms such as:
    • Fever
    • Chills
    • Muscle and joint aches
    • Nausea and loss of appetite
    • Headaches
    • Fatigue
  • Some may also develop:
    • Stiff neck
    • Confusion
    Some people also develop a rash.
    An untreated infection can cause difficulty breathing and bleeding.
    Headache and Neck Stiffness
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  • Diagnosis

    Your doctor will ask about your symptoms and medical history. You may not have known you were bitten or have a bite mark. The doctor may ask if you have spent time in areas known for ticks. A physical exam will be done
    A blood test may be done to:
    • Confirm the presence of the ehrlichiosis
    • Look for any other infection that may have been passed from the tick
    • Look for any signs of organ damage
  • Treatment

    Ehrlichiosis can be successfully treated with antibiotics.
    Other medications may be recommended to help relieve symptoms until the infection has cleared. It may take a few weeks before all of the symptoms have gone away completely.
  • Prevention

    Avoiding tick bites is the best way to prevent ehrlichiosis. Learn when ticks are most active in your area. Avoid tall grass, woods, and brush during these times. If you are in these areas:
    • Wear light colored clothing to make ticks easier to see.
    • Wear long pants and socks. Consider tucking your pants into your socks so the ticks have a harder time getting to your skin.
    • Use a bug repellant that contains DEET. Follow directions for use on container.
    After being outdoors:
    • Check yourself and your pets thoroughly for ticks.
    • Quickly remove any ticks that you have found.
    • If a tick is attached to the skin, remove it as soon as possible. Grab the tick close to your skin and pull out with steady pressure. Wash the area where the tick was attached with soap and water.
    It may take at least 24 hours for the infection to pass through the bite. Not all tick bites will cause an infection. If you were bitten by a tick, watch the area over the next few days. Call your doctor if you develop any symptoms.

    Centers for Disease Control and Prevention

    American Academy of Family Physicians


    Communicable Disease Control

    Public Health Agency of Canada


    Ehrlichiosis. American Academy of Family Physicians website. Available at: Updated January 2010. Accessed September 5, 2013.

    Ehrlichiosis. Centers for Disease Control and Prevention (CDC) website. Available at: Updated August 13, 2013. Accessed September 5, 2013.

    Ehrlichiosis. National Institute of Allergy and Infectious Diseases website. Available at: Updated September 7, 2012. Accessed September 5, 2013.

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