What term describes conditions where the host's tissues are damaged or their functions are altered by microorganisms?

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

Answer: (B)

Disease is the term for a condition in which the host’s tissues are damaged or their functions are altered by microorganisms. When a microbe invades the body, it can directly harm cells, produce toxins, or trigger processes that disrupt normal physiology, resulting in a measurable change from health.

Inflammation, while closely linked to infection, is the body's response to injury or infection and not the condition itself. You can have inflammation without damage caused by microbes, or inflammation in non-infectious injuries. Infection refers to the presence and growth of microorganisms in or on the body; it isn’t necessarily accompanied by tissue damage or symptoms. Contamination means microbes are simply present on a surface or in a location, without implying that they have caused tissue damage or altered function in a host.