Exam 1 Flashcards
(176 cards)
True/False. Identifying the specific agent of a disease is usually more important than mode of transmission.
False. Mode of transmission is more important
The interaction of what three factors are important in disease transmission?
Host, Agent, and Environment
A ___ is a habitat in which an infectious agent normally lives, grows, and multiplies.
Reservoir
What are the three questions asked when determining if an animal is a reservoir?
- Is it naturally infected with the pathogen?
- Can that species of animal maintain the pathogen over time?
- Can this source transit the disease to a new, susceptible host?
True/False: Clinically ill animals that are reservoir competent are probably infectious.
True
Are all sick animals reservoirs?
NO
____ transmission is from a reservoir host to its offspring.
Vertical
What are two examples of vertical transmission?
Congenital
Perinatal
What is horizontal transmission?
From the reservoir to a new host
True/ False: Skin- skin contact, Droplet spread, and Airborne transmission are all examples of indirect.
False. Direct
A ___ has to do with an inanimate object and ___ has to do with a living organisms that serve to communicate disease.
Vehicle
Vector
What are types of vehicles?
Common Vehicle: Food, water, IV drug contamination
Fomites: objects that can be contaminated and transmit disease on a limited scale
True/Fase: Most vectors are arthropods.
True
Which type of vector does not multiply or undergo part of its life cycle while in/on the arthropod?
Mechanical
What is a biological vector?
Agent that undergoes changes or multiplies while in the vector
A microbe tha tis replicating but not enough for the host to become infectious is known as ___ period.
Latent
What is the definition of incubation period?
Microbe that is infectious but not symptomatic yet.
All of the following relate to endemic stability except:
a. All factors influencing the disease are relatively stable
b. Result in large fluctuation in disease incidence over time
c. New cases occur at regular and low levels
d. Young can enter the population and old die/ are removed
b. Result in large fluctuation in disease incidence over time
**Little fluctuation*
What is a determinant?
Factors that help determine the probability, distribution, or severity of a disease in an animal or populations of animals.
The idea that infectious diseases can be contained if the population’s resistance to infection is high enough but does not protect individuals is the definition of?
Herd immunity
What can an epidemic curve tell you?
Most probable source of the outbreak if the pathogen is contagious If the outbreak is ending/ continue Incubation period of the pathogen (sometimes) About outliers
What are the waves separated by when we see several consecutive waves of infection?
Separated by an incubation period
In an epidemic curve of contagious diseases we have exposure filled by waves of ___ and ____ cases?
secondary and tertiary
What can you determine in a common source single point exposure epidemic curve?
The minimum, average and maximum incubation time