Claim: Daniel Cornelius Danielssen worked with Gerhard Armauer Hansen, discovering the bacteria causing leprosy, and with the dermatologist named Carl Wilhelm Boeck, (who specialized in research and treatment of syphilis) he was the co-author of an acclaimed study on lepra titled Om Spedalskhed (1847).
Evidence: He later worked with Gerhard Armauer Hansen, discovering the bacteria causing leprosy, and made Bergen a world centre of lepra research in the middle of the nineteenth century. With dermatologist Carl Wilhelm Boeck, he was co-author of an acclaimed study on lepra titled Om Spedalskhed (1847). Boeck specialized in research and treatment of syphilis.