Download Microbiology: PreTest Self-Assessment and Review by Richard C. Tilton PDF

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By Richard C. Tilton

Supplies clinical scholars 500 questions, solutions, and reasons to organize for the microbiology component of the USMLE Step 1. the recent version comprises many new questions within the two-step scientific structure to simulate the USMLE Step 1.

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Both the hemagglutinin and neuraminidase are glycoproteins under separate genetic control, and because of this they can and do vary independently. qxd 11/14/01 4:59 PM Page 53 Virology Answers 53 viruses. The paramyxoviruses include several important human pathogens (mumps virus, measles virus, respiratory syncytial virus, and parainfluenza virus). Both paramyxoviruses and orthomyxoviruses possess an RNAdependent RNA polymerase that is a structural component of the virion and produces the initial RNA.

However, before other measures (such as termination of pregnancy) are considered, a rubella immune status must be performed. A rubella titer of 1:10 is protective. 43. The answer is a. ) Mad Cow Disease is related to both scrapie in sheep and bovine spongiform encephalopathy virus. qxd 11/14/01 4:59 PM Page 41 Virology Answers 41 fear in Great Britain is the potential for acquiring Creutzfeldt-Jakob disease, which is a slowly progressive neurodegenerative disease. Theoretically, such acquisition could be through ingestion of beef from infected cows.

The answer is b. ) HCV is a positive-stranded RNA virus, tentatively classified as a flavivirus. About half of HCV patients develop chronic hepatitis. A large number of infections appear among IV drug abusers. About 90% of the cases of transfusion-associated hepatitis are thought to be caused by HCV. 68–71. The answers are 68-b, 69-d, 70-a, 71-c. ) Advances in the serodiagnosis of viral hepatitis have been dramatic, and the findings of specific viral antigens have led to further elucidation of the course of infections.

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