Vector born diseases: Chikungunda

10 important questions on Vector born diseases: Chikungunda

Which two human hosts do we have and what is the difference?

  • Low viremia levels
  • Mosquito has a preference for other species
  • The mosquito lives in other ecological regions

Which diseases does aedes aegypti transmit?

  • Yellow fever
  • Dengue
  • Chikungunya
  • ZIKA

Which one has the highest mortality?

Yellow fever virus
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What is epizootic transmission?

Normally dont cross the species barrier.

Epizootic transmission of mosquito-borne arboviruses from animal reservoirs can also cause human disease. It is in this context that humans are vulnerable to neurotropic diseases (such as encephalitis) as incidental hosts for zoonotic arboviruses such as:
• Japanese encephalitis virus (JEV)
• Venezuelan equine encephalitis virus (VEEV)
• West Nile virus (WNV
).

What is the difference between an enzootic cycle and an epizootic cycle?

DEFINITIONS

Enzootic: endemic in animals. Regularly affecting animals in a particular district or during a particular season. Often wild animals. Enzootic vector: a vector that transmits virus from an enzootic host to a human.

Epizootic: temporarily prevalent and widespread in an animal population/ a sharp increase in the number of new cases in an animal population. This may be livestock/domesticated animals. Epizootic vector: a vector involved in epizootic, but not enzootic events.
HUMAN DO NOT DEVELOP VIREMIA HIGH ENOUGH

Bridge vector: vector which bites both reservoir hosts and humans.

What is a bridge vector?

Bridge vector: vector which bites both reservoir hosts and humans.

What is Japanese encephalitis virus?

Avian arbovirus, can amplify in swine, which often live in close proximity to people and contribute to transmission.

What is Rift valley fever virus (RVFV)?

Rift valley fever virus (RVFV), can amplify in sheep, cattle and other domesticated livestock and contribute to transmission.

What is human-vector-human transmission and which virus is transmitted like this?

Zika. (sexual transmission)
Human is an amplification host = chikungunya

What are old arbo virusses? And what are new?

Isolated in Africa and Asia.
New:
south america, america and Australia

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