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Detection of lung lesions and Pneumocystis carinii in CD rats cohoused with Pneumocystis carinii-inoculated or sham-inoculated rats
| Group | Duration of cohousing (wk) | No. with lung lesions/ total no. of rats | No. PCR-positive for Pneumocystis/ total no. of rats |
| Cohoused with P. carinii-inoculated rats | 3 | 3/5 | 4/5 |
| 5 | 4/5 | 5/5 | |
| 7 | 6/6 | 6/6 | |
| Cohoused with sham-inoculated rats | 3 | 0/2 | 0/2 |
| 5 | 0/2 | 0/2 | |
| 7 | 0/3 | 0/3 |
