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5 Written questions

5 Matching questions

  1. 3 mechanisms of virus maintenance in nature
  2. 2 main animal borne viruses in the US
  3. Viruses with mosquito vectors
  4. type of genome of all viruses spread by animal vectors
  5. Mechanism of mosquito transmission
  1. a 1. Hibernating small animals
    2. transovarial transmission in arthropods = ticks and mosquitoes
    3. asymptomatic animal host with chronic infections
  2. b Rabies
    sin nombre
  3. c RNA
  4. d WEE
    La Crosse encephalitis
    dengue fever
    West Nile virus
  5. e Mosquito bites its subject injecting a bit of saliva containing the virus into the blood bypassing the skin barrier

5 Multiple choice questions

  1. -rabdovirus
    -Causes encephalitis
    - primary vectors are skunks, raccoons, foxes, bats, and dogs
  2. Caused by the sin nombre virus
    -mechanism of infection is inhalation of dried rodent urine and feces
    -target organ = lungs → pulmonary edema
    -little inflammation, necrosis, or cytopathic effect
    -mortality rate is 76%
  3. -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
  4. In most cases the endemic host animal is not killed by the virus; however rabies virus is the exception
    -viruses can be highly legal to humans
  5. Mosquito to monkey and back to mosquito
    -humans are incidental

5 True/False questions

  1. Complexities of arboviruses-Mosquito borne viruses must be able to replicate at ambient temperatures in the mosquito as well as that host body temperatures
    -this suggests a very broad host range


  2. Why animal vector viruses are dangerous to humansHumans have no natural resistance because they don't usually see these viruses
    -they are not the normal host


  3. Primary clinical manifestation of all of the major arboviruses in the USEncephalitis


  4. Prevention of vector viruses-Introduced into the bloodstream by infected insects
    -viral replication in reticuloendothelial system in vascular epithelium
    -secondary viremia can seed target organs


  5. enhancing antibodyAntibody 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


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