Which term is used to describe the method by which a disease-causing agent is spread?

Which term is used to describe the method by which a disease-causing agent is spread?

• A. Transmission
• B. Infection
• C. Contamination
• D. Virulence

Answer: (A)

The main idea here is how a disease-causing agent moves from one person or place to another. That movement from source to new host is called transmission. It covers the different routes the pathogen can take, such as direct contact, droplets, airborne spread, or via a vector or contaminated object. This is why it's the best fit for describing the method by which the agent is spread. Infection, by contrast, is what happens after the agent actually enters the body and begins to multiply, potentially causing illness. Contamination refers to the presence of the germ on surfaces, objects, or skin without necessarily having entered a new host. Virulence is about how harmful the agent is or how severe the disease it can cause. For example, flu can spread through airborne transmission, and infection occurs when the virus takes hold in the body.

The main idea here is how a disease-causing agent moves from one person or place to another. That movement from source to new host is called transmission. It covers the different routes the pathogen can take, such as direct contact, droplets, airborne spread, or via a vector or contaminated object. This is why it's the best fit for describing the method by which the agent is spread.

Infection, by contrast, is what happens after the agent actually enters the body and begins to multiply, potentially causing illness. Contamination refers to the presence of the germ on surfaces, objects, or skin without necessarily having entered a new host. Virulence is about how harmful the agent is or how severe the disease it can cause. For example, flu can spread through airborne transmission, and infection occurs when the virus takes hold in the body.