Define pathogen

A pathogen or irresistible operator is an organic specialist that makes infection or disease its host. The term is frequently utilized for specialists that disturb the ordinary physiology of a multicellular creature or plant. Be that as it may, pathogens can contaminate unicellular living beings from the majority of the organic kingdoms. There are a few substrates and pathways whereby pathogens can attack a host. The human body contains numerous regular guards against some of the basic pathogens as the human insusceptible framework and by some "accommodating" microbes present in the human body's ordinary verdure. A few pathogens have been observed to be in charge of enormous measures of losses and have effectively affected beset gatherings. Social advances, for example, nourishment security, cleanliness, and water treatment have diminished the danger from a few pathogens.