Friday, January 15, 2010

About Lyme Disease

Lyme disease is often associated with heavily wooded or grassy areas where mice and deer live. It's most common in the Northeast, the Pacific Northwest, and the northern Midwest states.
About Lyme Disease
Lyme disease is an infection caused by the bacterium Borrelia burgdorferi. This bacterium is usually found in small animals like mice. It can be carried to people from these animals by Ixodes ticks (known as black-legged or deer ticks). These ticks pick up Borrelia burgdorferi when they bite infected animals and then infect humans by biting them and passing the bacteria into the person's bloodstream.
Ticks are small and can be hard to see. Immature ticks, or nymphs, are about the size of a poppy seed. Adult ticks are about the size of a sesame seed.
It's important to know and watch for symptoms of Lyme disease because ticks are hard to find and it's easy to overlook a tick bite — in fact, many people who get Lyme disease don't remember being bitten. The good news is that most tick bites don't result in Lyme disease.
Signs and Symptoms
Lyme disease can affect different body systems, such as the nervous system, joints, skin, and heart. The symptoms of Lyme disease are often described as happening in three stages (although not everyone experiences all of these stages):
1.Usually, the first sign of infection is a circular rash. This rash appears within 1–2 weeks of infection but may develop up to 30 days after the tick bite. The rash often has a characteristic "bull's-eye" appearance, with a central red spot surrounded by clear skin that is ringed by an expanding red rash. It may also appear as an expanding ring of solid redness. It may be warm to the touch and is usually not painful or itchy. The bull's-eye rash may be more difficult to see on people with darker skin tones, where it may take on a bruise-like appearance.
The rash usually resolves in about a month. Although this rash is considered typical of Lyme disease, many people never develop it.
2.Along with the rash, a person may experience flu-like symptoms such as swollen lymph nodes, fatigue, headache, and muscle aches. Left untreated, symptoms of the initial illness may go away on their own. But in some people, the infection can spread to other parts of the body. Symptoms of this stage of Lyme disease usually appear within several weeks after the tick bite, even in someone who has not developed the initial rash. The person may feel very tired and unwell, or may have more areas of rash that aren't at the site of the bite.
Lyme disease can affect the heart, leading to an irregular heart rhythm or chest pain. It can spread to the nervous system, causing facial paralysis (Bell's palsy) or tingling and numbness in the arms and legs. It can start to cause headaches and neck stiffness, which may be a sign of meningitis. Swelling and pain in the large joints also can occur.
3.The last stage of Lyme disease can occur if the early stages of the disease were not detected or appropriately treated. Symptoms of late Lyme disease can appear any time from weeks to years after an infectious tick bite. They may include arthritis, particularly in the knees, and memory lapses (this last symptom happens mainly to adults and is rare in kids and teens).
Having such a wide range of symptoms can make Lyme disease difficult for doctors to diagnose. Fortunately, there's a blood test that looks for evidence of the body's reaction to Lyme disease.

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