Table 1.
Strains used in this study and relative characters
| Strain | Serogroup/Biotype | Location (province) | Year of isolation | Source | Cholerae toxin gene | Pigment | |
|---|---|---|---|---|---|---|---|
| 1 | N16961 | O1 El Tor | Bangladesh | 1971 | Patient | + | - |
| 2 | 569B | O1 classical | Calcutta, India | 1948 | Patient | + | - |
| 3 | 7743 | O1 El Tor | Guangdong | 1977 | Water | - | - |
| 4 | 3182 | O1 El Tor | Guangdong | 1994 | Patient | + | + |
| 5 | JS32 | O1 El Tor | Jiangsu | 1990 | Water | - | - |
| 6 | WJ-2 | O1 El Tor | Jiangsu | 1980 | Patient | + | - |
| 7 | 98-200 | O139 | Guangdong | 1998 | Water | - | + |
| 8 | 95-4 | O139 | Guangdong | 1995 | Water | - | + |
| 9 | JX2006136 | O139 | Jiangxi | 2006 | Water | - | + |
| 10 | JX2006175 | O139 | Jiangxi | 2006 | Water | - | + |
| 11 | GD200101012 | O139 | Guangdong | 2001 | Water | - | + |
| 12 | JX2006135 | O139 | Jiangxi | 2006 | Water | - | + |
| 13 | MO45 | O139 | Madras, India | 1992 | Patient | + | - |
| 14 | 98-514 | O139 | Anhui | 1998 | Water | - | - |
| 15 | 96-84 | O139 | Anhui | 1996 | Water | - | - |
| 16 | 94001 | O139 | Xinjiang | 1994 | Water | - | - |
| 17 | GD2006080 | O139 | Guangdong | 2006 | Water | - | - |
| 18 | JX2006101 | O139 | Jiangxi | 2006 | Water | - | - |
| 19 | JX2006102 | O139 | Jiangxi | 2006 | Water | - | - |
| 20 | JX2006177 | O139 | Jiangxi | 2006 | Water | - | - |
| 21 | JX2006127 | O139 | Jiangxi | 2007 | Water | - | - |
| 22 | JX2006129 | O139 | Jiangxi | 2008 | Water | - | - |
* Provinces are presented when the strain is from China.
# Pigment which can be observed in the culture condition of LB medium and 37°C.