TABLE 4.
Seasonal distribution of total V. cholerae, V. cholerae O1, and ctxA among each of the fractions sampled
| Target | Seasona | No. of positive samples/total (%) of:
|
||
|---|---|---|---|---|
| Water | Plankton (64 to 202 μm) | Plankton (>202 μm) | ||
| V. cholerae | Summer | 7/10 (70.0) | 5/10 (50.0) | 5/10 (50.0) |
| Fall | 4/12 (33.3) | 2/12 (16.7) | 2/12 (16.7) | |
| Winter | 4/11 (36.4) | 2/11 (18.2) | 4/11 (36.4) | |
| Spring | 10/17 (58.8) | 6/17 (35.3) | 4/17 (23.5) | |
| V. cholerae O1 | Summer | 3/7 (42.9) | 3/5 (60.0) | 4/5 (80.0) |
| Fall | 1/4 (25.0) | 2/2 (100) | 1/2 (50.0) | |
| Winter | 1/4 (25.0) | 0/1 (0.0)b | 3/4 (75.0) | |
| Spring | 4/10 (40.0) | 2/6 (33.3) | 3/4 (75.0) | |
| ctxA | Summer | 2/3 (66.7) | 0/3 (0.0) | 0/4 (0.0) |
| Fall | 1/1 (100) | 0/2 (0.0) | 0/1 (0.0) | |
| Winter | 1/1 (100) | 0c | 0/3 (0.0)c | |
| Spring | 1/4 (25.0) | 0/2 (0.0) | 0/33 (0.0) | |
a
Summer, January, February, March; Fall, April, May, June; winter, July, August, September; spring, October, November, December.
b
One sample missing.
c
No samples were positive for O1; ctxA was not tested.