A 65 year old man comes to the physician because of a one month history of an itching, red lesion on his left forearm that has become enlarged and ulcerated during the past two weeks. He has had no fever, chills, or weight loss. He recently returned from a six week trip to Suriname, China, and the Philippines. He has type two diabetes, mellitus that is well controlled with diet. His temperature is 37.2 C, pulse 84/min, and blood pressure 150/80 mmhg. Examination of the left upper extremity shows a 3 cm, non purulent ulcer with the raised borders over the forearm. Laboratory studies show a leukocyte count of 10,000 mm3. and the fasting serum glucose of 120mg/dl. Which of. the following is the most likely causal organism? A) Bruga malayi B) leishmania tropica C) schistosoma japonicum D)toxoplasma gondii E) trichinella spiralis

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Viral Infections

Viruses are abundantly found, minute entities that have genetic material enclosed within a protein coat. The proteinaceous material enclosing the genetic material of the virus is called a capsid. The genetic material could be either DNA (deoxyribonucleic acid) or RNA (ribonucleic acid). A virus is too minute to be looked at with naked eyes and therefore visualized with the help of a microscope. They are acellular entities that require a host for processes, such as replication, transcription, translation and multiplication. Plants, animals, and bacteria act as host wherein the virus reproduce. Viruses cannot multiply outside the host's body and thus are considered nonliving outside the host body.