TABLE 1.
Enterotoxic and lethal activities of Y. bercovieri CSF in infant mice
| Source | No. of strains producing lethal CSF (% lethality)a | No. of strains (mean fluid accumulation ratio ± SEM)
|
||
|---|---|---|---|---|
| Positive | Borderline positive | Negative | ||
| Clinical | 52 (69) | 56 (0.106 ± 0.02) | 7 (0.069 ± 0.009) | 12 (0.047 ± 0.01) |
| Foods | 5 (100) | 5 (0.105 ± 0) | 0 | 0 |
| Otherb | 7 (54) | 8 (0.102 ± 0.002) | 3 (0.072 ± 0.003) | 2 (0.050 ± 0.008) |
| Total | 64 (69) | 69 | 10 | 14 |
a
The percentages shown for clinical, food, and other isolates are expressed as the percent of lethal CSF-producing strains among the strains obtained from each source (e.g., 69% of the 75 clinical isolates yielded lethal CSF). The percentage shown for total isolates is for the CSF of all 93 Y. bercovieri strains tested.
b
Includes strains isolated from animals and environmental samples and those of unknown origin.