Question types

Start with

Question limit

of 52 available terms

Advertisement Upgrade to remove ads
Print test

5 Written questions

5 Matching questions

  1. diagnosis of insect vector diseases
  2. Hemorrhagic fevers
  3. Symptoms of hemorrhagic fevers caused by lassa, Ebola
  4. viruses that spread via the urban cycle transmission pattern
  5. Pathogenesis of West Nile encephalitis virus
  1. a Severe hemorrhage due to viral cytopathic effect in the vascular endothelium
  2. b -Yellow fever
    -dengue fever
    -St. Louis encephalitis
  3. c 1. Cultures are available for most of the Arboviruses
    -not routine
    -may involve inoculation of newborn mice
    2. diagnosis is usually made by serology using acute and convalescent sera
    -obtaining a sample can be troublesome
    -blood only contains virus during viremia
    -stool is negative
    -viruses rarely found in the throat or CNS
    3. PCR looks promising
  4. d -Mosquito bites human
    - virus enters bloodstream and replicates in local endothelial cells
    -secondary viremia seeds CNS
    -virus replicated in neurons and meninges
    -symptoms occur due to cell death and inflammation
  5. e High fever and bleeding are the primary symptoms
    -mortality rates can be as high as 80%
    -bleeding is due to multiple mechanisms depending on the virus

5 Multiple choice questions

  1. RNA
  2. -bunya/hanta virus
    -Hantavirus pulmonary syndrome
    -primary vector is wild mice
  3. Viruses are usually shed in the feces and urine of the endemic host animal its humans acquire the virus by inhalation of the dried fecal matter or urine
    -rabies can spread this way but most known for being spread by animal bites
  4. chikungunya= Clicking joint disease (found in Africa and the Indian Ocean islands)
  5. -Diagnosis of lassa and Ebola are only done by reference centers in the CDc (requires BL4 containment lab)
    -hantavirus is diagnosed by serology
    -rabies is diagnosed using immunohistochemistry on autopsied brain tissue

5 True/False questions

  1. Mechanism of yellow fever hemorrhagic sequelaeLiver disrupts production of clotting factors leading to bleeding
    -black vomit can also be seen


  2. viruses employing the sylvan cycleSin Nombre


  3. Mechanism of mosquito transmissionMosquito bites its subject injecting a bit of saliva containing the virus into the blood bypassing the skin barrier


  4. dead end or incidental hosts-Somebody who is at the wrong place at the right time and is bitten or infected by a true host
    -virus can replicate in incidental hosts and cause disease but incidental hosts cannot serve as a reservoir and can't transmit the infection to another host
    -if mosquitoes or ticks feed off of an incidental hosts the titers are so low transmission will not occur


  5. Mechanism of tick transmissionVirus is shed into the feces of the tick and onto the skin of the human; itching introduces the contaminated feces into the host by breaking the skin barrier