期刊
INTERNATIONAL JOURNAL OF MEDICAL MICROBIOLOGY
卷 297, 期 6, 页码 443-449出版社
ELSEVIER GMBH
DOI: 10.1016/j.ijmm.2007.01.009
关键词
V. cholerae O1; classical; El Tor; PCR; hybrid; PFGE; DNA
资金
- NIAID NIH HHS [R01 AI039129] Funding Source: Medline
Vibrio cholerae O1 strains that are hybrids between the classical and El Tor biotypes were isolated during two consecutive years (2004-2005) from diarrheal patients in Mozambique. Similar variants isolated in Bangladesh and recently isolated El Tor strains were analyzed for genetic diversity. Pulsed-field gel electrophoresis (PFGE) analysis using the restriction enzyme NotI, resulted in 18-21 bands showed five closely related PFGE patterns that were distributed similarly in both years (2004-2005) among the 80 strains tested in Mozambique. Overall based on the PFGE patterns the hybrids indicated an El Tor lineage. The restriction patterns of whole-chromosomal DNA grouped the hybrid strains from Mozambique into a separate cluster from Bangladeshi clinical and environmental hybrid strains. A high molecular weight band of 398 kb that contain rstR allele of the classical type was detected from all hybrid strains, which was absent in all conventional classical and El Tor strains. This band could be designated as a marker for the hybrid strains. This study suggests that hybrid strains from Mozambique are closely related to each other, different from Bangladeshi hybrid strains that are diverse in nature and all hybrid strains differed markedly from conventional classical and El Tor strains. (c) 2007 Elsevier GmbH. All rights reserved.
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