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According to recent medical historiography, investigations in the 19th century regarding the cause of leprosy were conducted by Norwegian and British researchers. The most important person is the Norwegian scientist Gerhard Henrik Armauer Hansen who, in 1873 identified the causal microorganism of leprosy (Hansen’s disease), Mycobacterium leprae. There is still something new to be learnt by unravelling the historical process, through which this bacterium was discovered. The Norwegians M. Harboe and L.M. Irgens have both made historical notes. Harboe points out that: ‘Drognat Landré wrote a treatise in 1869 on the basis of his epidemiological studies in Dutch Guiana. He found that careful investigations of Europeans who got leprosy in Surinam strongly indicated that their illness was caused by infectious contact with leprosy patients. We know that this work made a strong impression on Armauer Hansen, but obviously not on the contemporary medical world’. Irgens writes: ‘: : :it seems that this treatise had a decisive influence on the young Norwegian physician G.H. Armauer Hansen and on his view on the etiology of the disease.’ Little has been published about Drognat Landré and his research work, although in 1996 the French scientist V. Corruble referred to him as the founder of the theory of leprosy contagionism. In this paper we shall describe Drognat Landré and how he arrived in the 1860’s at his controversial concept of leprosy contagionism.

Charles Louis Drognat Landré and Gerhard Henrik Armauer Hansen; Contribution from a Dutch Colony to the Discovery of the Leprosy Bacterium