<prompt> The earliest discovery of a pathogenic microorganism was made byAugustino BassiPollenderOliver WendellLouis pasteur  <response>: The earliest discovery of a pathogenic microorganism was probably made by Augustino Bassi1835, showed that the muscardine disease of silkworms was caused by a fungus.Ref: Ananthanarayan; 7th edition; Page no: 1 