What 3 components make up the epidemiologic triangle?
Agent, Host, Environment.
Agent, Condition, Variable
Agent, Host, Condition
Agent, Host, Disease
The Correct Answer is A
A. Agent, Host, Environment: The epidemiologic triangle consists of:
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Agent – The cause of disease (e.g., bacteria, viruses, toxins).
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Host – The person or animal affected by the disease.
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Environment – External factors that influence disease transmission (e.g., climate, sanitation, population density).
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B. Agent, Condition, Variable: "Condition" and "Variable" are not standard components of the epidemiologic triangle. The correct term is host (the affected person or animal).
C. Agent, Host, Condition: "Condition" is not part of the triangle. The environment is a crucial factor that influences the spread of disease.
D. Agent, Host, Disease: "Disease" is an outcome rather than a component of the epidemiologic triangle. The triangle focuses on the factors that contribute to disease spread, including the environment.
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Related Questions
Correct Answer is C
Explanation
A. Poultry: Poultry is more commonly associated with Salmonella and Campylobacter infections rather than E. coli 0157:H7.
B. Water parks: While waterborne outbreaks can occur, direct animal contact is a greater risk factor for E. coli 0157:H7 infection.
C. Petting zoos: Petting zoos pose a significant risk because E. coli 0157:H7 can be transmitted through contact with infected animals and their feces. Children and immunocompromised individuals are especially vulnerable.
D. Carrots: While contaminated produce has been linked to E. coli outbreaks, petting zoos pose a higher risk due to direct exposure to infected animals.
Correct Answer is C
Explanation
A. A recent potluck that had a petting zoo: While petting zoos can be sources of zoonotic infections like E. coli or Salmonella, they are not associated with botulism, which comes from improperly processed foods.
B. A recent potluck that served spinach: Spinach can harbor bacterial infections like E. coli or Listeria, but it is not a common source of botulism unless improperly canned.
C. A recent potluck that served baked beans out of a bent can: Botulism is caused by Clostridium botulinum, a bacterium that produces neurotoxins in improperly canned, preserved, or stored foods. A bent or bulging can suggests contamination and potential toxin production, making it the most likely cause of botulism in this scenario.
D. A recent potluck that served pork products: Pork can transmit trichinosis (from undercooked meat) or bacterial infections (Salmonella, Listeria), but botulism is primarily linked to canned foods, not pork products.
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