Volume 15, Number 2—February 2009
Letter
Outbreaks Caused by New Variants of Vibrio cholerae O1 El Tor, India
Neelam Taneja
, Arti Mishra, Garima Sangar, Gagandeep Singh, and Meera Sharma
, Arti Mishra, Garima Sangar, Gagandeep Singh, and Meera SharmaTable
Phenotypic and genotypic traits of Vibrio cholerae O1 clinical strains isolated from northern India, 2002–2007*
| Year of isolation or type of strain | Phenotypic tests |
PCR amplicons |
||||||
|---|---|---|---|---|---|---|---|---|
| VP | Polymyxin B (50 U) susceptibility | CCA | Sheep erythrocyte hemolysis | tcpA | ctxB (MAMA-PCR) | rstR | ||
| 2002 (n = 20) | + | Resistant | + | + | E | E | E | |
| 2003 (n = 4) | + | Resistant | + | + | E | E | E | |
| 2004 (n = 19) | + | Resistant | + | + | E | E | E | |
| 2007 (n = 26) | + | Resistant | + | + | E | E + C (n = 21)† | E | |
| Environmental (n = 1) | + | Resistant | + | + | E | E + C | E | |
| Classical 569B | – | Sensitive | – | – | C | C | C | |
| El Tor N16961 | + | Resistant | + | + | E | E | E | |
| Hybrid NICED, India | + | Resistant | + | + | E | C | E + C | |
*VP, Voges-Proskauer; CCA, chick cell agglutination; MAMA, mismatch amplification mutation assay; +, positive; –, negative; E, El Tor type; C, classical type; NICED, National Institute of Cholera and Enteric Diseases, Kolkata, India.
†Remainder had ctxB of El Tor type.
