Nosema bombycis[1] is a species of Microsporidia of the genus Nosema infecting silkworms, responsible for pébrine.

This species was the first microsporidium described, when pebrine decimated silkworms in farms in the mid-19th century.

This description was made by Carl Nägeli.

Louis Pasteur, taking up an idea of Osimo which had not been successful,[2] showed breeders a practical way to select uninfected individuals to recreate new healthy farms.

This fungus-related article is a stub.