TABLE 1.
Effect of infectious dose on infectivity and incubation perioda
| Infection rate and dose (IFU) | No. of animals | % of animals infected | Mean length of incubation period (days) | Mean length of active shedding (days) |
|---|---|---|---|---|
| Artificial | ||||
| 104 | 5 | 100 | 3.6 (0.04) | 16.8 (0.001) |
| 103 | 14 | 79 | 4.9 | 17.7 (0.0005) |
| 102 | 10 | 70 | 9.5 | 16.3 (0.005) |
| 101 | 5 | 40 | 9.0 | 15.0 (NA) |
| 100 | 5 | 0 | ||
| Sexual contact | 19 | 62.2 | 8.3 | 9.9 |
a
Values in parentheses are P values obtained by one-tailed t test versus results for the sexual-contact control group. NA, not applicable (too few values).