Daniel Cornelius Danielssen worked with Gerhard Armauer Hansen, discovering the bacteria causing leprosy, and with the urologist named Carl Wilhelm Boeck, he was the co-author of an acclaimed study on lepra titled Om Spedalskhed (1847).
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). 
