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Journal of Clinical Microbiology, February 2004, p. 741-745, Vol. 42, No. 2
0095-1137/04/$08.00+0 DOI: 10.1128/JCM.42.2.741-745.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.
Leprosy Research Center, National Institute of Infectious Diseases, Tokyo,1 National Leprosarium Oshima-Seisho-En, Kagawa, Japan,3 and Leprosy-TB Program, Provincial Health Service, Manado, North Sulawesi,2 Leprosy Study Group, Tropical Disease Center, Kampus C UNAIR, Airlangga University, Surabaya, Indonesia4
Received 4 July 2003/ Returned for modification 20 August 2003/ Accepted 3 November 2003
The polymorphism of TTC repeats in Mycobacterium leprae was examined using the bacilli obtained from residents in villages at North Maluku where M. leprae infections are highly endemic (as well as from patients at North Sulawesi of Indonesia) to elucidate the possible mode of leprosy transmission. TTC genotypes are stable for several generations of passages in nude mice footpads and, hence, are feasible for the genotyping of isolates and epidemiological analysis of leprosy transmission. It was found that bacilli with different TTC genotypes were distributed among residents at the same dwelling in villages in which leprosy is endemic and that some household contacts harbored bacilli with a different genotype from that harbored by the patient. Investigations of a father-and-son pair of patients indicated that infections of bacilli with 10 and 18 copies, respectively, had occurred. Genotypes of TTC repeats were found to differ between a son under treatment and two brothers. These results reveal the possibility that in addition to exposure via the presence of a leprosy patient with a multibacillary infection who was living with family members, there might have been some infectious sources to which the residents had been commonly exposed outside the dwellings. A limited discriminative capacity of the TTC polymorphism in the epidemiological analysis implies the need of searching other useful polymorphic loci for detailed subdivision of clinical isolates.
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