Vector Biology Flashcards
Define vector.
agent that actively transmitts pathogen
Distinguish between mechanical & biological vectors.
mechanical: picks up pathogen & transfers, no pathogen development of multiplication vs. biological: pathogen develops and/or multiplies in vector
Cyclodevelopmental transmission
pathogen undergoes development but no multiplication
Propagative transmission
pathogen multiplies, no development
Cyclopropagative transmission
development & multiplication of pathogen
Give examples of blood feeding arthropods & the diseases they transmit.
- mosquito 2. tasetse fly - sleeping sickness 3. kissing bug - Chages Disease 4. ticks - Babesia (rlated to malaria)
What does a pathogen need to do to be successful in vector and transmit to the next host?
vector confidence - ability of particular vector to become infected w/ a specific pathogen & transmit it
Define vector competence.
ability of arthropods to acquire, maintain, and transmit microbial agents
How is vector competence determined?
infection rate and transmission rate must be determined
Define vector capacity.
how many elements you can put in
What extrinsic factors affect vector capacity?
- regular feeding on particular host 2. feed for extended period of time & take a large blood meal 3. life span - long enough to allow parasite to develop to infective stage 4. abundance 5. dispersal ability
Distinguish between primary & secondary vectors.
primary: competent vector w/ high capacity, able to maintain parasite transmission in absence of other vector spp vs. secondary: competent vector w/ low capacity, able to transmit parasite, unable to maintain cycle in absence of primary vector
Explain why Anopheles freeborni will not contribute to the transmission of malaria in California.
mosquitoes don’t live long enough to transmit parasite
