Volume 14, Number 6—June 2008
Letter
Vibrio cholerae O1 Hybrid El Tor Strains, Asia and Africa
Ashrafus Safa*, Jinath Sultana*, Phung Dac Cam†, James C. Mwansa‡, and Richard Y.C. Kong*
Table
Phenotypic and genotypic traits of Vibrio cholerae O1 clinical strains isolated from Asia and Africa, 1991–2004*
| Test strain origin (no. examined) or reference strain ID | Year(s) of isolation | rfbO1 | Phenotypic tests |
PCR amplicons |
Cholera toxin type† (no. strains) | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| CCA | Polymyxin B (50 U) | Voges-Proskauer | tcpA (El Tor) | tcpA (classical) | rtxC | |||||
| Japan (6) | 1991–1997 | + | + | Resistant | + | + | – | + | Classical (5), El Tor (1) | |
| Hong Kong (18) | 1998–2000 | + | + | Resistant | + | + | – | + | Classical (11), El Tor (7) | |
| Zambia (8) | 1996–2004 | + | + | Resistant | + | + | – | + | Classical (5), El Tor (3) | |
| China (3) | 1999 | + | + | Resistant | + | + | – | + | Classical (3), El Tor (0) | |
| Sri Lanka (1) | 1998 | + | + | Resistant | + | + | – | + | Classical (1), El Tor (0) | |
| Vietnam (5) | 1994–2002 | + | + | Resistant | + | + | – | + | Classical (5), El Tor (0) | |
| Classical 569B | 1948 | + | – | Sensitive | – | – | + | – | Classical | |
| El Tor N16961 | 1971 | + | + | Resistant | + | + | – | + | El Tor | |
*rfbO1, O-antigen biosynthesis genes; CCA, chicken cell agglutination; tcp, toxin-coregulated pilus; rtx, repeat in toxin.
†Based on ctxB sequence. GenBank accession nos. for the ctxB sequences are EU156448–EU156488.
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