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Defense systems against pathogens are a critical life-support system of fish that helps protect against infection. A complex network of immune cells and molecules that are located at the interface between the environment and the host, the mucosal immune system of vertebrates, such as fish, is the first line of defense against life-threatening pathogens.

Researchers at the University of New Mexico recently discovered an olfactory immune system in fish previously thought to be associated with terrestrial vertebrates only. The results could provide a new tool for the control of infectious diseases in ...