The medical condition caused by growth and spread of harmful organisms within the body is

The medical condition caused by growth and spread of harmful organisms within the body is

• A. Infectious diseases
• B. Communicable diseases
• C. Pathogen
• D. Contamination

Answer: (A)

Infectious diseases are illnesses caused by growth and spread of microorganisms such as bacteria, viruses, fungi, or parasites inside the body. This definition directly matches the idea of a condition that arises when harmful organisms multiply and invade tissues, causing symptoms and disease. A pathogen is the microorganism that causes the disease, not the disease itself. Contamination refers to the presence of unwanted substances or organisms in an environment or item, not the disease produced inside a person. Communicable describes whether a disease can be transmitted from one person to another; many infectious diseases are communicable, but the statement focuses on the disease caused by internal growth and spread, which is best captured by the term infectious diseases.

Infectious diseases are illnesses caused by growth and spread of microorganisms such as bacteria, viruses, fungi, or parasites inside the body. This definition directly matches the idea of a condition that arises when harmful organisms multiply and invade tissues, causing symptoms and disease.

A pathogen is the microorganism that causes the disease, not the disease itself. Contamination refers to the presence of unwanted substances or organisms in an environment or item, not the disease produced inside a person. Communicable describes whether a disease can be transmitted from one person to another; many infectious diseases are communicable, but the statement focuses on the disease caused by internal growth and spread, which is best captured by the term infectious diseases.