Arthritis and Lyme Disease

Lyme disease is a bacterial infection transmitted by a tick. Lyme disease was first recognized in 1975, after researchers investigated why unusually large numbers of children were being diagnosed with juvenile rheumatoid arthritis in Lyme, Conn., and two neighbouring towns.

The investigators discovered that most of the affected children lived near wooded areas likely to harbor ticks. They also found that the children's first symptoms typically started in the summer months coinciding with the height of the tick season.

Several of the patients reported having a peculiar skin rash just before developing arthritis symptoms, and many also recalled being bitten by a tick at the rash site.

Further investigations resulted in the discovery that tiny deer ticks infected with a spiral-shaped bacterium or spirochete (which was later named Borrelia burgdorferi) were responsible for the outbreak of arthritis in Lyme. Ordinary "wood ticks" and "dog ticks" do not carry the infection.

In addition to causing arthritis, Lyme disease can also cause heart, brain, and nerve problems.

How Is Lyme Disease Transmitted?

Lyme disease is transmitted through a bite from a specific type of tick. The animals that most often carry these insects are white-footed field mice, deer, raccoons, opossums, skunks, weasels, foxes, shrews, moles, chipmunks, squirrels, and horses. 

 the Symptoms of Lyme Disease

In the early stages of Lyme disease, one may experience flu-like symptoms that can include a stiff neck, chills, fever, swollen lymph nodes, headaches, fatigue,muscle aches, and joint pain. You also may experience a large, expanding skin rash around the area of the tick bite. In more advanced disease, nerve problems and arthritis, especially in the knees, may occur.

Here are some more details:

• Erythma migrans. Erythema migrans is the telltale rash which occurs in about 70% to 80% of cases and starts as a small red spot that expands over a period of days or weeks, forming a circular, triangular, or oval-shaped rash. Sometimes the rash resembles a bull's-eye because it appears as a red ring surrounding a central clear area. The rash, which can range in size from that of a dime to the entire width of a person's back, appears between three days and a few weeks of a tick bite, usually occurring at the site of a bite. As infection spreads, several rashes can appear at different sites on the body.
  Erythema migrans is often accompanied by symptoms such as fever, headache, stiff neck, body aches, and fatigue. These flu-like symptoms may resemble those of common viral infections and usually resolve within days or a few weeks.
• Arthritis. After several weeks of being infected with Lyme disease, approximately 60% of those people not treated with antibiotics develop recurrent attacks of painful and swollen joints that last a few days to a few months. The arthritis can shift from one joint to another; the knee is most commonly affected and usually one or a few joints are affected at any given time. About 10% to 20% of untreated patients will go on to develop lasting arthritis. The knuckle joints of the hands are only very rarely affected.
• Neurological symptoms. Lyme disease can also affect the nervous system, causing symptoms such as stiff neck and severe headache (meningitis), temporary paralysis of facial muscles (Bell's palsy), numbness, pain or weakness in the limbs, or poor coordination. More subtle changes such as memory loss, difficulty with concentration, and a change in mood or sleeping habits have also been associated with Lyme disease. People with these latter symptoms alone usually don't have Lyme disease as their cause.
  Nervous system abnormalities usually develop several weeks, months, or even years following an untreated infection. These symptoms often last for weeks or months and may recur. These features of Lyme disease usually start to resolve even before antibiotics are started. Patients with neurologic disease usually have a total return to normal function.
• Heart problems. Fewer than one out of 10 Lyme disease patients develops heart problems, such as an irregular, slow heartbeat, which can be signaled bydizziness or shortness of breath. These symptoms rarely last more than a few days or weeks. Such heart abnormalities generally appear several weeks after infection, and usually begin to resolve even before treatment.
• Other symptoms. Less commonly, Lyme disease can result in eye inflammation and severe fatigue, although none of these problems is likely to appear without other Lyme disease symptoms being present.

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Diagnosis of Lyme Disease 

Lyme disease may be difficult to diagnose because many of its symptoms mimic those of other disorders. Although a tick bite is an important clue for diagnosis, many patients cannot recall having been bitten by a tick. This is not surprising because the tick is tiny, and a tick bite is usually painless.

The easiest way for a doctor to diagnose Lyme disease is to see the unique bull's-eye rash. If there is no visible rash (as is the case in about one-fourth of those infected), the doctor might order a blood test three to four weeks after the onset of the suspected infection to look for antibodies against the bacteria. Unfortunately, the Lyme disease bacterium itself is difficult to isolate or culture from body tissues or fluids. 

Other tests. Some patients experiencing nervous system symptoms may also undergo a spinal tap. A spinal tap is a procedure in which spinal fluid is removed from the spinal canal for the purpose of diagnosis in a laboratory. Through this procedure, doctors can detect brain and spinal cord inflammation and can look for antibodies against the Lyme disease bacterium in the spinal fluid.

Treatment

In its early stages, Lyme disease can be effectively treated with antibiotics. In general, the sooner such therapy is begun following infection, the quicker and more complete the recovery. Antibiotics, such as doxycycline or amoxicillin taken orally for two to four weeks, can speed the healing of the rash and can usually prevent subsequent symptoms such as arthritis or neurological problems. There is no compelling evidence that prolonged antibiotic therapy is more effective than two weeks of therapy. Prolonged antibiotic use may have serious side effects.

Intravenous (IV) antibiotics may be used for more serious cases and for someone whose nervous system has been affected. Lyme disease with arthritis also can be treated with antibiotics. Most patients experience full recovery.

Patients younger than 9 years or pregnant or lactating women with Lyme disease are treated with amoxicillin or penicillin because doxycycline can stain the permanent teeth developing in young children or unborn babies. Patients allergic to penicillin are given erythromycin or related antibiotics.

Doctors prefer to treat Lyme disease patients experiencing heart symptoms with antibiotics such as Rocephin, Claforan, or penicillin given intravenously for about two weeks. If these symptoms persist or are severe enough, patients may also be treated with corticosteroids or given a temporary internal cardiac pacemaker. People with Lyme disease rarely experience long-term heart damage.

Following treatment for Lyme disease, some people still have persistent fatigue and achiness. This general malaise can take months to slowly disappear, although it generally does so spontaneously without the use of additional antibiotic therapy. There is no evidence that the Borrelia infection causes chronic fatigue syndrome or fibromyalgia. Although some patients with Lyme disease may develop these problems, as with other patients who get chronic fatigue or fibromyalgia, long-term antibiotics will not hasten recovery.

Prevention-

Try these tips to prevent tick bites:

• Wear long sleeves and tightly woven clothing that is light in color when walking in wooded areas so the ticks can be seen more easily.
• Wear your shirt tucked into your pants, and your pants tucked into your socks or boots.
• Walk in the center of trails through the woods to avoid picking up ticks from overhanging grass and brush.
• Keep grass trimmed as short as possible.
• Apply tick repellents with DEET to your clothing, shoes and socks before going out. Another tick repellent called permethrin, designed to be placed on the clothing can be used alone or in combination with DEET. (Although highly effective, these repellents can cause some serious side effects, particularly when high concentrations are used repeatedly on the skin. Infants and children may be especially at risk for adverse reactions.)
• Check yourself, your family, and your pets routinely for ticks, especially after a trip outdoors.
• Shower and shampoo your hair if you think you may have been exposed to ticks.
• Check your clothes for ticks and wash them immediately in order to remove any ticks.

If an infected tick bites, it will not transmit the infection until it has had the opportunity to have its blood meal. This takes time, thus there is value in inspecting your body after outdoor activities in areas where Lyme disease is known to occur. Newly attached ticks can be easily removed before they transmit the infection.

Pregnant women should be especially careful to avoid ticks in Lyme disease areas because the infection can be transferred to the unborn child. Such a prenatal infection can make the woman more likely to miscarry.

Preventative antibiotics are not generally used following all tick bites, but may be used in some special circumstances; a recent study showed that such preventive use of antibiotics is very effective.

If you are bitten by a tick, the best way to remove it is by taking the following steps:

• Tug gently but firmly with blunt tweezers near the "head" of the tick until it releases its hold on the skin
• To lessen the chance of contact with the bacterium, try not to crush the tick's body or handle the tick with bare fingers
• Swab the bite area thoroughly with an antiseptic to prevent infection
• DO NOT use kerosene, Vaseline, fingernail polish, or a cigarette butt
• DO NOT squeeze the tick's body with your fingers or tweezers.

Care for People With Lyme Disease

Most people with Lyme disease respond well to antibiotic therapy and recover fully. Some people may have persistent symptoms or symptoms that recur, making further antibiotic treatment necessary. If left untreated, Lyme disease can cause permanent damage to the heart, nervous system, and joints.

A bout with Lyme disease and successful treatment are no guarantee that the illness will be prevented in the future. The disease can strike more than once in the same individual if he or she is bitten by another tick and re-infected with the Lyme disease bacterium. The antibody test usually remains positive for months to many years after an infection. The presence of antibodies in the blood is not sufficient reason for continued or re-treatment with antibiotics.

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