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Mycobacterium lepromatosis Lepromatous Leprosy in US Citizen Who Traveled to Disease-Endemic Areas - Volume 24, Number 5—May 2018 - Emerging Infectious Disease journal - CDC

Mycobacterium lepromatosis Lepromatous Leprosy in US Citizen Who Traveled to Disease-Endemic Areas - Volume 24, Number 5—May 2018 - Emerging Infectious Disease journal - CDC

Volume 24, Number 5—May 2018


Mycobacterium lepromatosis Lepromatous Leprosy in US Citizen Who Traveled to Disease-Endemic Areas

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To the Editor: The article by Virk et al. (1) highlighted that a person can acquire Mycobacterium lepromatosis infection without exposure to a person infected with leprosy or to known vectors during short stays (2 trips of 7 days each over 3 calendar years) in Mexico. The authors then concluded that M. lepromatosis lepromatous leprosy is a travel-related hazard for travelers to Mexico or other disease-endemic areas. We note that the exact source of acquiring the M. lepromatosis infection by the patient in this study was entirely uncertain, and experimental evidence was not enough to prove M. lepromatosis to be a travel-related hazard.
In contrast, Jessamine et al. (2) reported M. lepromatosis infection and leprosy-like illness in a patient in Canada who had no history of contact or travel to leprosy-endemic areas. Jessamine et al. indicated that transmission dynamics of M. lepromatosis infection is complex, and undiscovered mechanisms or unknown reservoir interactions may exist in such areas of nonendemic regions. Previous studies have also reported the roles of subclinical cases and environmental reservoirs in the transmission of leprosy (3,4). However, Virk et al. have not disentangled other possible sources (existence of unrecognized subclinical cases, contact with hidden leprosy cases, and environmental reservoir) of prolonged exposure of M. lepromatosis to the study patient in his vicinity. Thus, the assertion of Virk et al. (1) that United States citizens can acquire M. lepromatosis when traveling to Mexico or other leprosy-endemic areas as tourists is misleading and demands extensive research to prove it.
In addition, it is intriguing to note that host genetic determinants can influence the acquisition and onset of leprosy (5). Therefore, the inference of a single case study cannot be generalized for all citizens of the United States. The data from these reports suggest that the epidemiologic studies of leprosy in nonendemic areas should consider travel history to delineate this issue.
Ajay Vir SinghComments to Author  and Devendra Singh Chauhan
Author affiliations: ICMR-National JALMA Institute for Leprosy and Other Mycobacterial Diseases, Agra, India


  1. Virk APritt BPatel RUhl JRBezalel SAGibson LEet al. Mycobacterium lepromatosis lepromatous leprosy in US citizen who traveled to disease-endemic areas. Emerg Infect Dis2017;23:18646DOIPubMed
  2. Jessamine PGDesjardins MGillis TScollard DJamieson FBroukhanski Get al. Leprosy-like illness in a patient with Mycobacterium lepromatosis from Ontario, Canada. J Drugs Dermatol2012;11:22933.https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=22270208&dopt=Abstract
  3. Araújo SLobato JReis EMSouza DOGonçalves MACosta AVet al. Unveiling healthy carriers and subclinical infections among household contacts of leprosy patients who play potential roles in the disease chain of transmission. Mem Inst Oswaldo Cruz2012;107(Suppl 1):559DOIPubMed
  4. Mohanty PSNaaz FKatara DMisba LKumar DDwivedi DKet al. Viability of Mycobacterium leprae in the environment and its role in leprosy dissemination. Indian J Dermatol Venereol Leprol2016;82:237DOIPubMed
  5. Alter AAlcaïs AAbel LSchurr ELeprosy as a genetic model for susceptibility to common infectious diseases. Hum Genet2008;123:22735DOIPubMed
Cite This Article

DOI: 10.3201/eid2405.171972

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