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Rubella (German Measles)The disease is caused by an RNA virus spread by airborne droplet nuclei or by close contact. A patient can transit the disease from 1 wk before onset of the rash until 1 wk after it fades. Congenitally infected infants are potentially infectious for many |
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Salmonella InfectionSalmonella is a rod-shaped, motile bacterium -nonmotile exceptions S. gallinarum and S. pullorum-, nonsporeforming and Gram-negative. There is a widespread occurrence in animals, especially in poultry and swine. Environmental sources of the organism inclu |
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Schistosomiasis (Bilharziasis)Schistosomes that affect man are digenetic trematodes. Freshwater snails are the intermediate hosts. Human infection follows contact (eg by bathing or wading) with free swimmig cercariae of the paraiste; they penetrate the skin and migrate to the intrehep |
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Sexually Transmitted Diseases (STDs)The incidence of STDs, among the most common communicable diseases in the world, steadily increased from the 1950s to the 1970s but generally stabilized in the 1980s. Some disease (eg HIV infection, syphilis, gonorrhea) increased in incidence at the end o |
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Shigellosis (Bacillary Dysentery)The genus Shigella is distributed worldwide and is the typical cause of inflammatory dysentery, often responsible for 5 to 10% of diarrheal illness in many areas |
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SinusitisThese two conditions are often related and may be the result of a heavy cold. The lining of your nose may become inflammed and this produces a mucus discharge. When it's severe, this may be thick and can cause a blocked nose (nasal congestion). A thin, ru |
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SinusitisThe sinuses are protected against infection by mucociliary action. The normal mucus produced by the sinuses is removed through small openings into the nose called ostia. When the ciliary action is impaired or the ostia are obstructed, mucus can accumulate |
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Strep ThroatStrep throat is caused by a bacteria, while most other throat infections are caused by viruses. Symptoms of strep throat include fever, sore throat, and swollen neck lymph glands. Diagnosis of strep throat is confirmed by a throat culture or rapid-strep t |
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