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5 Written Questions

5 Matching Questions

  1. sylvan cycle for yellow fever
  2. enhancing antibody
  3. 4 predominant syndromes caused by viruses transmitted by animals
  4. viruses that spread via the urban cycle transmission pattern
  5. Mechanism of yellow fever hemorrhagic sequelae
  1. a Mosquito to monkey and back to mosquito
    -humans are incidental
  2. b -Yellow fever
    -dengue fever
    -St. Louis encephalitis
  3. c Liver disrupts production of clotting factors leading to bleeding
    -black vomit can also be seen
  4. d -Encephalitis
    - fever with uremic syndrome
    -pulmonary syndrome
    -hemorrhagic fever
  5. e Antibody made to the viral serotype encountered during the initial infection which ends up being not only useless at clearing a 2nd infection from a different serotype but also harmful to the host

5 Multiple Choice Questions

  1. 1. Hibernating small animals
    2. transovarial transmission in arthropods = ticks and mosquitoes
    3. asymptomatic animal host with chronic infections
  2. bats
  3. -rabdovirus
    -Causes encephalitis
    - primary vectors are skunks, raccoons, foxes, bats, and dogs
  4. Mosquitoes to humans and back to mosquitoes
    -humans are considered endemic hosts
  5. Yellow fever and dengue fever
    -it is important to take a good travel history as part of your exam
    -also consider recommending vaccines for people traveling to specific areas around the globe

5 True/False Questions

  1. Urban cycleDoesn't occur in cities because the viruses are maintained by transmission between animal and insect; humans are just incidental hosts
    -examples = yellow fever, WEE, VEE, lacrosse, West Nile


  2. dead end or incidental hostsThe incidence of infection is much higher than the number of people that develop clinical symptoms
    -for every person that develops West Nile encephalitis there are approximately 150 people who are infected


  3. Pathogenesis of ArbovirusesControl exposure to vector


  4. Human to human transmission1. Patient gets bitten by and in fact dead skunk, Fox, bat, raccoon, dog, cat
    2. virus replicates in muscle tissue at the site of the bite and spread to local nerve cells
    3. travels via retrograde transport to CNS and replicates in the gray matter virus
    4. virus will also spread to salivary glands via nerves


  5. sin nombre virus-bunya/hanta virus
    -Hantavirus pulmonary syndrome
    -primary vector is wild mice


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