Which term is the agent that causes disease?

Which term is the agent that causes disease?

• A. Pathogen
• B. Host
• C. Reservoirs
• D. Communicable Disease

Answer: (A)

The main idea here is to identify the disease-causing agent. A pathogen is the organism or particle that actually causes disease, such as bacteria, viruses, fungi, parasites, or prions. It’s the agent that initiates illness when it infects a host. In contrast, a host is the person or animal that can be infected, a reservoir is the place where the pathogen lives and multiplies (which can be soil, water, animals, or humans), and a communicable disease describes whether the illness can be transmitted from one host to another, focusing on spread rather than the cause. So, the term that names the disease-causing agent is pathogen.

The main idea here is to identify the disease-causing agent. A pathogen is the organism or particle that actually causes disease, such as bacteria, viruses, fungi, parasites, or prions. It’s the agent that initiates illness when it infects a host. In contrast, a host is the person or animal that can be infected, a reservoir is the place where the pathogen lives and multiplies (which can be soil, water, animals, or humans), and a communicable disease describes whether the illness can be transmitted from one host to another, focusing on spread rather than the cause. So, the term that names the disease-causing agent is pathogen.