TABLE 1.
Endpoint day of detection of human waterborne pathogens in oysters and in seawatera
| Pathogen species | Endpoint day of detection in water with salinity ofb:
|
|||||
|---|---|---|---|---|---|---|
| 8 ppt (low)
|
12 ppt (medium)
|
20 ppt (high)
|
||||
| Oysters | Water | Oysters | Water | Oysters | Water | |
| Cryptosporidium parvum | 33 (H) | 1 | 33 (H) | ND | 27 (H) | ND |
| Giardia lamblia | 14 (H) | 1 | 6 (H) | ND | 6 (GH) | ND |
| Encephalitozoon intestinalis | 6 (H) | 33 | 27 (H) | 33 | 27 (H) | 1 |
| Encephalitozoon hellem | 6 (GH) | 33 | 27 (H) | 33 | 27 (H) | 1 |
| Enterocytozoon bieneusi | 6 (GH) | 33 | 27 (H) | 33 | 27 (H) | 1 |
a
Commercial market-size (>7.6-cm) triploids of Asian (Suminoe) oysters (C. ariakensis) maintained in 30-gallon-capacity marine tanks with water of various salinities were sampled (in batches of five specimens) together with the filtered water on day 6, 10, 14, 18, 22, 27 and 33 pwi with 1.0 × 105 transmissive stages of each of the pathogens. All samples collected before the endpoint day were pathogen positive.
b
Organisms were detected in hemolymph (H) and/or gills (G) of oysters. ND, not detected.