Amoebiasis is an infection caused by the protozoan, Entamoeba histolytica, which is usually contracted by drinking water or eating food contaminated with amoebic cysts. Most of the infected people are asymptomatic…

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Tuberculosis (TB): Types, Symptoms, and Risks


Tuberculosis (TB) is an infectious disease caused by the bacterium, Mycobacteriumtuberculosi. TB most commonly affects the lungs but can involve almost any organ of the body. There is also a group…

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Several rickettsia species cause the disease known as epidemic typhus in humans. The disease is spread by ticks, mites, fleas, or lice, each agent having a distinct epidemiology, but all…

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Rabies is a serious viral disease that affects central nervous system. It is an infectious disease of animals caused by a bullet-shaped, enveloped RNA virus, 180 x 75 nm. Man…

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Japanese Encephalitis Japanese encephalitis is a potentially severe viral disease that is spread by infected mosquitoes in the agricultural regions of Asia. It is one of several mosquito-borne virus diseases…

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Dengue Fever Dengue fever is an infectious disease carried by mosquitoes and caused by any of four related dengue viruses. This disease used to be called break-bone fever because it…

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The term plasmid was first introduced by the American molecular biologist JoshuaLederberg in 1952. Plasmid is an extra chromosomal DNA molecule that is capable of replicating independently from the chromosomal DNA and…

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