TABLE 3.
DFA counts of V. cholerae O1 and O139 in the samples collected from six pond sites in Mathbaria, adjacent to the Bay of Bengala
| Mo | Sample type | DFA count (cells/liter) of indicated V. cholerae serovar
|
|||
|---|---|---|---|---|---|
| O1
|
O139
|
||||
| Round 1 | Round 2 | Round 1 | Round 2 | ||
| March | 64-μm fraction (plankton) | <10 | ND | <10 | ND |
| 20-μm fraction (plankton) | 1.3 × 101 | ND | 1.9 × 101 | ND | |
| Water | <10 | ND | <10 | ND | |
| April | 64-μm fraction (plankton) | ND | ND | ND | ND |
| 20-μm fraction (plankton) | ND | ND | ND | ND | |
| Water | ND | ND | ND | ND | |
| May | 64-μm fraction (plankton) | 7.5 × 101 | <10 | <10 | 3.8 × 101 |
| 20-μm fraction (plankton) | <10 | <10 | <10 | <10 | |
| Water | 2.3 × 104 | <10 | 5.0 × 101 | <10 | |
| June | 64-μm fraction (plankton) | 2.5 × 101 | 5.3 × 102 | 3.0 × 101 | 3.2 × 101 |
| 20-μm fraction (plankton) | 1.7 × 101 | 3.8 × 101 | 5.4 × 101 | 2.6 × 101 | |
| Water | <10 | 1.8 × 105 | <10 | <10 | |
| July | 64-μm fraction (plankton) | 8.8 × 101 | <10 | 1.0 × 102 | 1.3 × 101 |
| 20-μm fraction (plankton) | 1.9 × 101 | 1.3 × 101 | 3.4 × 101 | 1.3 × 101 | |
| Water | 2.3 × 104 | 5.0 × 103 | 5.0 × 103 | 1.3 × 101 | |
| August | 64-μm fraction (plankton) | 1.6 × 103 | <10 | 2.0 × 102 | 2.6 × 101 |
| 20-μm fraction (plankton) | 3.8 × 101 | <10 | 3.4 × 101 | 6.0 × 101 | |
| Water | 2.5 × 105 | 5.0 × 103 | 3.0 × 104 | <10 | |
| September | 64-μm fraction (plankton) | 3.4 × 102 | 2.6 × 102 | <10 | <10 |
| 20-μm fraction (plankton) | 3.6 × 102 | 3.7 × 102 | <10 | 5.1 × 101 | |
| Water | 3.9 × 104 | 2.0 × 104 | <10 | 3.0 × 104 | |
| October | 64-μm fraction (plankton) | <10 | <10 | <10 | <10 |
| 20-μm fraction (plankton) | <10 | <10 | <10 | 5.0 × 102 | |
| Water | <10 | <10 | <10 | <10 | |
| November | 64-μm fraction (plankton) | <10 | <10 | 1.0 × 102 | <10 |
| 20-μm fraction (plankton) | 2.5 × 102 | <10 | <10 | <10 | |
| Water | <10 | 5.0 × 103 | <10 | <10 | |
| December | 64-μm fraction (plankton) | 3.5 × 103 | <10 | <10 | <10 |
| 20-μm fraction (plankton) | 4.5 × 102 | 4.4 × 101 | <10 | <10 | |
| Water | 3.4 × 107 | 3.3 × 104 | <10 | <10 | |
a
Values are the geometric means of six replicates of each sample. Samples were collected twice each month. Rounds 1 and 2 represent biweekly counts in Mathbaria. ND, not done.