Pathogens

In biology, a pathogen is any organism or agent that may cause illness. An infectious agent or plain old germ can also be used to refer to a pathogen. In the 1880s, the word "pathogen" first appeared. The term "pathogen" is often used to refer to an infectious microbe or agent, such as a virus, bacterium, protozoan, prion, viroid, or fungus. Insects and helminths are examples of small animals that carry or spread illness. Instead of being called pathogens, these creatures are more frequently referred to as parasites. Microbiology is the scientific study of microscopic organisms, especially tiny harmful organisms, whereas parasitology is the study of parasites and the host species that they inhabit. Pathogens can enter a host through a variety of channels. Although the episodic time periods for the main routes vary, soil has the longest or most persistent capacity for pathogen harborage. Pathogens can enter a host through a number of different channels. Although the episodic time scales for the main routes vary, soil has the longest or most persistent capacity for pathogen harborage. Pathogenic diseases are illnesses that affect people and are brought on by infectious agents. There are additional sources of disease than viruses, such as chemicals, genetic abnormalities, and the host's own immune system. host organisms for them. Pathogens can enter a host through a number of different channels. Although the episodic time scales for the main routes vary, soil has the longest or most persistent capacity for pathogen harborage. Pathogenic diseases are illnesses that affect people and are brought on by infectious agents.