JCH-NACA Animal Control Officer Test 2025 – 400 Free Practice Questions to Pass the Exam

The term that describes the animal that carries the disease is "Host." A host is an organism that harbors a pathogen, which is the actual agent of disease, but the host may not necessarily show signs of illness. In the context of disease transmission, hosts can be critical in the life cycle of pathogens, as they provide an environment where the pathogen can grow and reproduce.

In contrast, a pathogen refers specifically to the microorganism, such as bacteria or viruses, that causes the disease. A vector typically denotes an organism, often an insect, that transmits the pathogen to a host. Environmental agents are non-living factors in the surroundings that can contribute to the health of an organism but do not carry disease in the same way that hosts do. Understanding these distinctions is crucial for recognizing how diseases spread and the roles different organisms and factors play in the transmission process.