L7: Epidemiology Flashcards
The epidemiologic triad is a pattern of interaction between: ____, _____, and ____
1) susceptible HOST
2) agent
3) environment
True or False: Getting a microbe via kissing or interacting with in animal is a type of direct contact
True
What’s the difference between a biological and mechanical vector?
Biological vector: involves part of the pathogen lifecycle ; transmission via saliva or feces
Mechanical vector: passive transport of a pathogen on a vector’s body
True or False: The chain of transmission is: source for agent => portal of exit => mode of transmission => portal of entry
True
A continual source of infection is called a ____ of infection
reservoir
Human reservoirs are people who…..
1) have a disease
2) carry a pathogenic microorganism
____ are disease that affect wild and domestic animals and can be transmitted to humans
Zoonoses
True or False: Soil can be a non-living reservoir of C. botulinum, C. tetani, or fungi
True
True or False: Improperly prepared or stored foods can be nonliving reservoirs
True
Respiratory route, saliva, GI, skin to skin, blood-borne are examples of:
A. Vertical Spread
B. Horizontal Spread
B. Horizontal Spread
What is the most common and most difficult to control form of horizontal transmission?
Respiratory route
In the respiratory route of horizontal transmission, the ___ is equal to the ___
Po exit = Po entry
True or False: The larger a droplet nuclei (respiratory secretion or droplet), the longer it remains suspended in the air for longer than 20 minutes and can penetrate and attach to upper/lower respiratory tract
False - the SMALLER droplets remain suspended in the air for ~20 minutes
Which type of infectious disease is not transmitted (or at least not routinely transmitted) from person to person?
Non-communicable infectious disease
How can a non-communicable disease arise from one’s normal flora?
Aspiration of normal flora can lead to pneumonia
Provide an example of an environmental pathogens that can cause a non-communicable disease.
Provide an example of a zoonoses that can cause a non-communicable disease.
Environmental = Tetanus
Zoonoses = Rabies
Communicable disease are those transmissible from person to person. What are the three routes by which a disease can be spread person to person? Which is the most common?
1) Horizontal Spread - most common!
2) Vertical Spread
3) Zoonotic Spread
Which four conditions can be spread via salivary horizontal transmission?
EBV
Oral/genital herpes
CMV
Rabies
What are two horizontal routes by which GI pathogens can spread?
1) Fecal-oral route
2) Aerosolized vomitus
Which two microbes can be horizontally transmitted via: aerosolized vomitus?
H. pylori
Norovirus
True or False: Compromised skin allows for more pathogen access
True
True or False: Staph and Strep can be transmitted via: skin to skin contact
True