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Archives 2007
Myanmar Health Sciences Research Journal
Volume 19, Number 1
TITLE: Genotyping of Mycobacterium leprae on the basis of the polymorphism of TTC repeats for analysis of leprosy transmission.
AUTHOR: Khin Saw Aye; Yin Thet Nu Oo; Kyaw Kyaw; Masanori Matsuoka
SOURCE: Myanmar Health Sciences Research Journal. 2007; 19(1): 6-12
ABSTRACT: The polymorphism of TTC repeats in Mycobacterium leprae was examined using bacilli from skin slit of leprosy patients attending at Central Special Skin Clinic, YGH and nasal swabs of their contacts to elucidate the possible mode of leprosy transmission. It was found that bacilli with different TTC genotypes were distributed among same household contacts and also harbored bacilli in patients were different TTC genotype from that harbored by the contacts. Genotypes of TTC repeats were found to differ between husband under treatment and his wife and also mother under treatment and her sons living in same house. These results revealed the possibility that in addition to exposure via the presence of a leprosy patient with a multibacillary (MB) 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. It was found that TTC genotype of bacilli harbored by household contacts was different with the TTC genotype by index cases. It was seen in the resident where TTC genotype was different in husband (index case) and his wife (HC) and the mother (index case) and her sons (HC). These results revealed that whether the family members get transmission either from their MB index cases or from outside the dwellings.
SUBJECT HEADINGS: Genotype. Mycobacterium leprae. Polymorphism (Genetics).
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