A clone of Leptospira interrogans sensu stricto is the major cause of leptospirosis in the archipelago of Andaman and Nicobar Islands, India.
OBJECTIVE
Andaman and Nicobar Islands in India has a century long history of human leptospirosis. Several isolates have been recovered over the years from different locations. The present study was undertaken to understand the clonal relationship between all these pathogenic leptospires recovered from these islands.


RESULTS
Arbitrarily primed polymerase chain reaction (AP-PCR) was employed to genetically characterize 40 isolates recovered during 1995--2001 and their fingerprints were compared with those of 26 reference strains of known genetic and serological affinities. Sequences of PCR-amplified products from representative isolates were compared with those of different strains belonging to seven genospecies. AP-PCR fingerprints revealed that 32 of the 40 isolates were clonal in nature and fingerprints of all the isolates matched with known reference strains of pathogenic Leptospira interrogans sensu stricto. Comparison of sequence data of PCR amplified products of reference strains and isolates also corroborated these findings.


CONCLUSIONS
The study revealed that 80% of the isolates recovered from these islands were clonal in nature and all the isolates taken in the study belonged to Leptospira interrogans sensu stricto.


CONCLUSIONS
An extension of the study in animal population would help in understanding the transmission dynamics of this commonly circulating clone in these islands, which in turn might help in effective control of this public health problem.
Roy
S
S
WHO Collaborating Centre for Diagnosis, Research, Training and Reference in Leptospirosis, Regional Medical Research Centre (Indian Council of Medical Research), Port Blair, Andaman and Nicobar Islands, India.
Biswas
D
D
Vijayachari
P
P
Sugunan
A P
AP
Sehgal
S C
SC
D001483:Base Sequence; D002999:Clone Cells; D004269:DNA, Bacterial / Q000235:genetics; D007194:India; D007921:Leptospira interrogans / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D007922:Leptospirosis / Q000382:microbiology*; D008969:Molecular Sequence Data; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D012703:Serotyping
D004269:DNA, Bacterial