Vector Borne Diseases Flashcards
What are the basic elements of the transmission cycle?
- Disease agent
- The vector
- Primary Resivoir or host
- Permissible environment
What are the components of a disease agent?
- Virus
- Bacteria
- Protozoa
What are the components of the vector?
- Insects: Diptera, Hemiptera, Fleas,
- Non insect: Ticks and mites
What are the components of the primary resivoir
- Vertebrae that is readily infected and can host LONG enough to serve as host to vectors
What are the components of a permissible environment?
- Agent vector and host requirements to propogate or transmit
What components make up the transmission cycle for malaria?
- Disease agent: Single celled parasite: plasmodium
- The vector: Anopheles mosquito
- Primary reservior or host: Host: Human
- Permissible environment: Warm environment human will not get malaria treatment
What are the two modes of transmission?
- Zoonosis
- Anthroponosis
What is zoonosis?
Any disease or infection that is naturally transmissible from vertebrate animals to humans
What is anthroponosis?
Diseases that are transmissible from human to human
What is R naught?
Basic reproducctive rate that determines whether an epidemic will occur
When does an epidemic occur?
If R naught is less than one, and fails if R naught is greater than one
Write out what each symbol represents in the formula for R naught
get paper and write it
What is persistence?
Disease remaining and spreading after initial invasion
What does persistence require?
Susceptible hosts
What is critical community size?
The threshold host population size above which disease fade out is unlikely
