The Web of Life (36-3) Bacteria continued


In dealing with bacteria as pathogens, medical science has termed subspecies of bacteria by strain and type. A strain (variety) of bacteria is a culture from a single parent, but which differs from other bacterial cultures of the same species by structure or metabolism. A type of bacteria is a subspecies that varies in immunities (serotype), susceptibility to viruses (phage type), or pathogenic properties (pathotype).