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HerbsMed.com
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An Alternative Medicine Network |
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| Common Illness
Amebiasis |
Legionellosis (Legionnaires' disease) What is legionellosis? Legionellosis is a bacterial disease which may cause pneumonia. Approximately 3 percent of pneumonia cases occurring in New York State are due to the legionnella bacterium. Why is it called legionellosis? An outbreak of this disease in Philadelphia in 1976, largely among people attending a state convention of the American Legion, led to the name "Legionnaires' Disease." Subsequently, the bacterium causing the illness was named Legionella pneumophila and the name of the illness was changed to legionellosis. Is this a new disease? No. While the bacterium was only recently identified, earlier cases have been confirmed as far back as 1947, and cases probably occurred before that date. How widespread is legionellosis? It is estimated that about 25,000 people develop legionellosis in the United States each year. An additional unknown number are infected with the legionella bacterium and have mild symptoms or no illness at all. Cases occur sporadically and in outbreaks. Outbreaks occur most often in the summer but cases occur all year round. How severe is the illness? Legionellosis can be a mild respiratory illness or it can be severe enough to cause death. From 10 to 40 percent of healthy adults have antibodies showing previous exposure to the organism, but only a small percentage have a history of previous pneumonia. Where are legionella found? Legionella are widely distributed in our environment. They have been found in creeks and ponds, hot and cold water taps, hot water tanks, water in air conditioning cooling towers and evaporative condensers, and soil at excavation sites. How is legionellosis spread? The disease appears to be spread through the air from a soil or water source. All studies to date have shown that person to person spread does not occur. Who gets legionellosis? Patients have ranged in age from 10 months to 84 years. The disease most often affects middle-aged or older men, particularly those who smoke or drink heavily. People with underlying illnesses such as cancer or those with lowered immune system resistance to disease are also at higher risk. What are the usual symptoms of legionellosis?
Muscle Aches How soon do symptoms occur/appear? The incubation period for legionellosis ranges from two to 10 days, but is usually five to six days. What is the treatment for legionellosis? Antibiotics such as erythromycin appear to be effective in treating the disease. Why is legionellosis so difficult to diagnose? Legionellosis often causes symptoms similar to those caused by other organisms, including influenza virus and other types of bacterial pneumonia. Since diagnosis depends on culturing the organisms or comparison of blood tests taken during and several weeks after the illness, the diagnosis may not be confirmed until after the person is well. When does the health department investigate a case of legionellosis? Because sporadic cases are common and presently not preventable, they are often investigated only to confirm the diagnosis and rule out an outbreak. If an outbreak occurs, an investigation to look for a possible environmental source is conducted.
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