Which term describes the invasion of a host by organisms such as bacteria, viruses, or parasites, with or without signs of disease?

Which term describes the invasion of a host by organisms such as bacteria, viruses, or parasites, with or without signs of disease?

• A. Infection
• B. Inflammation
• C. Contamination
• D. Infestation

Answer: (A)

Infection is the invasion and multiplication of microorganisms inside the body, and it can occur with or without symptoms of illness. This distinguishes it from other terms: inflammation is the body's immune response to such invasion rather than the invasion itself; contamination refers to organisms being present on surfaces or skin without actually entering or invading tissues; and infestation usually describes parasites living on or inside the body, such as mites or lice. Sometimes a person may harbor the organisms without feeling sick (subclinical infection) or have colonization without disease, but the key idea remains the arrival and growth of the organisms within the host.

Infection is the invasion and multiplication of microorganisms inside the body, and it can occur with or without symptoms of illness. This distinguishes it from other terms: inflammation is the body's immune response to such invasion rather than the invasion itself; contamination refers to organisms being present on surfaces or skin without actually entering or invading tissues; and infestation usually describes parasites living on or inside the body, such as mites or lice. Sometimes a person may harbor the organisms without feeling sick (subclinical infection) or have colonization without disease, but the key idea remains the arrival and growth of the organisms within the host.