Answer :
Answer:
"infectious disease" or "communicable disease."
Explanation:
Final answer:
An infectious disease is caused by pathogenic organisms that enter the body, potentially spreading between individuals. Pathogens include bacteria, viruses, fungi, and protozoa, and these organisms can cause disease by multiplying and damaging host tissues. Not all infections lead to disease, as some can exist in the host without causing harm.
Explanation:
A disease caused by pathogenic organisms that enter the body, and which may or may not be spread from one person to another person, is known as an infectious disease. These diseases are the result of infections by pathogens such as bacteria, viruses, fungi, and protozoa, which can multiply within the host's body and cause tissue damage or poison the host. Some infectious diseases are transmitted through direct contact, airborne particles, or via a vector, an organism that carries pathogens from one host to another.
Infectious diseases can lead to an immune response that may contribute to tissue damage. Not all infections lead to infectious diseases; some pathogens can colonize the body without causing noticeable symptoms. However, when the infection impairs normal function or causes harm, it is classified as a disease. The term etiology refers to the study of these causes in medicine, with the etiologic agent being the pathogen responsible for the disease.