Cholera outbreak in South Africa, 2008-2009: laboratory analysis of Vibrio cholerae O1 strains.
J Infect Dis
; 208 Suppl 1: S39-45, 2013 Nov 01.
Article
em En
| MEDLINE
| ID: mdl-24101643
ABSTRACT
BACKGROUND:
A total of 720 Vibrio cholerae O1 strains were recovered for investigation from an outbreak of cholera in South Africa between November 2008 and April 2009.METHODS:
Strains were characterized by serotype testing. Antimicrobial susceptibility testing. Genetic diversity of 248 strains was investigated using pulsed-field gel electrophoresis (PFGE) analysis. Extended characterization was performed on 90 strains. Molecular analysis included polymerase chain reaction (PCR) identification of ctxA and tcpA genes, sequencing the ctxAB gene, and investigation of molecular mechanisms conferring antimicrobial resistance.RESULTS:
The majority of strains were characterized as serotype Ogawa. Strains showed multidrug resistance. Approximately 1.0% of strains displayed extended-spectrum ß-lactamase (ESBL) activity. Strains showed very similar PFGE patterns. Ninety strains selected for extended characterization showed the followingresults:
Strains possessed the cholera toxin (CT) and all were PCR positive for the tcpA-El Tor variant. Sequencing of the ctxB gene matched the B-1 allele. Strains harbored the SXT element. Strains that displayed ESBL activity possessed a 140-kilobase-pair plasmid that produced the TEM-63 ß-lactamase. Nalidixic acid-resistant strains harbored mutations in GyrA (Ser83-Ile) and ParC (Ser85-Leu).CONCLUSIONS:
These data highlight the rapid development of antimicrobial resistance and spread of V. cholerae O1 El Tor variants expressing the classical CT within South Africa.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Sorotipagem
/
Cólera
/
Surtos de Doenças
/
Vibrio cholerae O1
Limite:
Humans
País/Região como assunto:
Africa
Idioma:
En
Revista:
J Infect Dis
Ano de publicação:
2013
Tipo de documento:
Article