Medical Entomology Final Prep
a pt who is native to GA & has not traveled out of state is hospitalized with symptoms that include myalgia & petechial rash
Rocky Mountain Spotted Fever
apyrase, a protein found in mosquito saliva
breaks down ADP & blocks platelets from aggregating
Biological Transmission
colonizes vector & completes part of life cycle, vector remains infected for life
vertical transmission
transfer from mother to offspring
a vector biologist is attempting to identify the vector of a new virus that causes disease in goats. she does some field work, collecting blood-feeding arthropods from the goats, & identified a tick that is also infected with the virus. has she correctly identified the virus?
NO, she needs to demonstrate under lab conditions that the tick can acquire the virus from an infected host & that the tick can transmit the virus to an uninfected host
in arthropods digestion & nutrient absorption occur in the:
both in midgut
which statement correctly describes the sequence of events involved in molting?
-PTTH is released from corpus cardiacum -stimulating the corpus allatum to release ecdysone
what are characteristics of the Order Acari?
-pedipalps small with sensory function -four pairs of legs in adults -chelicerate mouthparts
in arthropods what tissue/organ eliminates metabolic wastes from the hemolymph?
Malpighian tubules
first demonstration that arthropods play a role in transmission of some pathogen is attributed to
Manson, who studied lymphatic filariasis
you find an arthropod that has one pair of antennae on the head & the body consists of numerous segments, each with one pair of legs. what group does this arthropod belong to:
Scorpiones
function of the spiracle is to
allow oxygen & CO2 to enter/leave the trachae
what feature or features are found in both the Crustacea & Scorpions?
chelate appendages
horizontal transmission
direct transfer of pathogen
the interval of time between a vector takes an infectious meal & when it begins to transmit the pathogen, is referred to as the:
extrinsic incubation period
Sarcoptes mites
form a burrow into the skin and feed on lymph fluid and inflammatory cells that respond to the irritation
what feature or features would you expect to see in an olfactory sensillum?
pores distributed over whole surface
what strategy has been effective in dramatically reducing cases of Dracunculiasis?
providing clean water & filter straws for use with potentially contaminated water
Mechanical transmission
uncommon, carried by a vector to a host on surface or in gut without completing any parts of life cycle in the vector