By James D. Kettering

PreTest is the clinical student’s so much dynamic weapon for acing the USMLE Step 1. nice for direction evaluation and tests, too! Microbiology PreTest asks the correct questions so you’ll be aware of the suitable solutions. Open it and begin studying what’s at the try out. PreTest is the nearest factor you will get to seeing the try sooner than you are taking it. This unique try out prep consultant allows you to: *Get to understand fabric on track tests and the USMLE Step 1 *Practice with 500 clinically-oriented multiple-choice questions *Review key evidence for examination luck *Build self assurance, talents, and data there are many solutions in the market. yet in simple terms PreTest promises the best questions. pupil confirmed AND REVIEWED “Some questions about the USMLE looked as if it would have come correct out of my PreTest!” --a clinical scholar who lately handed the USMLE Step 1

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Extra info for Microbiology : PreTest Self-Assessment & Review (Microbiology: Pretest Self-Assesment & Review)

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The answers are 102-a, 103-c, 104-b, 105-e, 106-d. ) Hepatitis A virus (HAV) possesses a single-stranded linear RNA genome while hepatitis B virus (HBV) contains a doublestranded DNA genome. Detection of anti-HAV IgM in a single serum specimen obtained in the acute or convalescent stage is the quickest and most reliable method to diagnose hepatitis A infection. This antibody is usually present at onset of symptoms and may persist 3 to 6 months. Demonstration of hepatitis B surface antigen (HBsAg) in serum is the most common method of diagnosing HBV infection.

Koplik’s spots, pale, bluish-white spots in red areolas, can frequently be observed on the mucous membranes of the mouth and are pathognomonic for measles. 30. The answer is e. ) The definitive diagnosis of rabies in humans is based on the finding of Negri bodies, which are cytoplasmic inclusions in the nerve cells of the spinal cord and brain, especially in the hippocampus. Negri bodies are eosinophilic and generally spherical in shape; several may appear in a given cell. Negri bodies, although pathognomonic for rabies, are not found in all cases of the disease.

Louis encephalitis, yellow fever, and dengue are caused by flaviviruses. Western equine encephalitis is caused by an alphavirus. Laboratory diagnosis is usually made by demonstration of a fourfold rise in specific antibody titer in paired sera. 37. The answer is a. ) Ribavirin is effective to varying degrees against several RNA- and DNA-containing viruses in vitro. qxd 40 11/14/01 4:59 PM Page 40 Microbiology tions in infants. Intravenous administration has proved effective in treating Lassa fever.

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