what is a pathogen definition
A bacterium, virus, or other microorganism that can cause disease. Example sentences. 1  Symptoms and signs of influenza in children are not specific and can mimic a range of other common respiratory viral pathogens.2  Such changes may also happen within a class, especially for bacterial pathogens.3  A part of the stool sample was processed for the detection of bacterial pathogens.xample sentences. 1  Symptoms and signs of influenza in children are not specific and can mimic a range of other common respiratory viral pathogens. 2  Such changes may also happen within a class, especially for bacterial pathogens. 3  A part of the stool sample was processed for the detection of bacterial pathogens.