What term describes the ability of an organism to cause disease with clinical signs or symptoms?

Prepare for the Introduction to Epidemiology and Concepts of Infectious Disease Test with detailed study materials and multiple-choice questions. Arm yourself with knowledge and insights to excel in infectious disease diagnostics.

Multiple Choice

What term describes the ability of an organism to cause disease with clinical signs or symptoms?

Explanation:
Pathogenicity describes the capacity of a microorganism to cause disease in a host, resulting in clinical signs or symptoms. It focuses on whether the microbe can lead to disease, not merely on entering the body or being detected by the immune system. Infectivity is about establishing infection itself — getting inside and establishing a foothold — which can happen without causing disease. Virulence refers to how severe or damaging the disease is once it occurs, not to whether disease occurs at all. Immunogenicity is about the ability of a microbe to provoke an immune response. Therefore, the ability to cause disease with clinical signs or symptoms is captured by pathogenicity.

Pathogenicity describes the capacity of a microorganism to cause disease in a host, resulting in clinical signs or symptoms. It focuses on whether the microbe can lead to disease, not merely on entering the body or being detected by the immune system.

Infectivity is about establishing infection itself — getting inside and establishing a foothold — which can happen without causing disease. Virulence refers to how severe or damaging the disease is once it occurs, not to whether disease occurs at all. Immunogenicity is about the ability of a microbe to provoke an immune response.

Therefore, the ability to cause disease with clinical signs or symptoms is captured by pathogenicity.

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