Nobre ML, Dupnik KM, Nobre PJ, Freitas De Souza MC, Dűppre NC, Sarno EN, Jerŏnimo SM. Human migration, railways and the geographic distribution of leprosy in Rio Grande do Norte State--Brazil. Leprosy review. 2015 Dec;86(86). 335-44. PMID: 26964429 [PubMed] PMCID: PMC5350582 NIHMSID: NIHMS784946.
Leprosy is a public health problem in Brazil where 31,044 new cases were detected in 2013. Rio Grande do Norte is a small Brazilian state with a rate of leprosy lower than other areas in the same region, for unknown reasons.