disease caused by bacteria pathogen
Overview. A pathogen is a biological agent, or germ, that causes disease to its host by interrupting normal body processes. Bacteria, viruses, fungi and parasites are all common types of pathogens that can cause pathogenic, or infectious, diseases.These pathogens can be found in the air, soil and water, and infection can occur as a result of touching, eating or drinking something that is infected with a germ.acteria, viruses, fungi and parasites are all common types of pathogens that can cause pathogenic, or infectious, diseases. These pathogens can be found in the air, soil and water, and infection can occur as a result of touching, eating or drinking something that is infected with a germ.