The growth and spread of small, harmful organisms within the body is known as an ________ disease.

The growth and spread of small, harmful organisms within the body is known as an ________ disease.

• A. Infectious
• B. Contagious
• C. Autoimmune
• D. Degenerative

Answer: (A)

The growth and spread of small, harmful organisms within the body is called an infectious disease. Pathogens such as bacteria, viruses, fungi, or parasites invade tissues, multiply, and cause illness, which is why this term fits. Contagious refers to how easily an infection spreads from person to person, which is about transmission rather than the disease itself; some infections are contagious, some are not. Autoimmune diseases involve the immune system attacking the body's own tissues, not pathogens multiplying. Degenerative diseases are about progressive decline in function over time, not infections. So the best fit for the description is infectious disease.

The growth and spread of small, harmful organisms within the body is called an infectious disease. Pathogens such as bacteria, viruses, fungi, or parasites invade tissues, multiply, and cause illness, which is why this term fits. Contagious refers to how easily an infection spreads from person to person, which is about transmission rather than the disease itself; some infections are contagious, some are not. Autoimmune diseases involve the immune system attacking the body's own tissues, not pathogens multiplying. Degenerative diseases are about progressive decline in function over time, not infections. So the best fit for the description is infectious disease.