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PCA titers in sera from intranasally immunized micea
| Day | Mean titer of immunization group
|
|
|---|---|---|
| TT only | TT + CT | |
| 7 | <30 | <30 |
| 10 | <30 | 90–270 |
| 14 | <30 | 30 |
| 21 | <30 | ≤30 |
Sera from mice intranasally immunized with TT only or TT in combination with CT (days 0, 7, and 14) were assayed for reagenic antibody by PCA reaction. Sera from animals (n = 9 for each time point except for day 10 [n = 3]) were pooled.
