TABLE 3.
Bactericidal activity of carrier sera against a meningococcal PorA-negative straina
| Student no. | Titer against strain H44/76
|
|
|---|---|---|
| PorA+ | PorA− | |
| 9 | 32,000 | 8,000 |
| 15 | 8,000 | 8,000 |
| 30 | 5,600 | 4,000 |
| 37 | 132,000 | 32,000 |
| 38 | 8,000 | 8,000 |
a
Sera from serogroup B carriers taken at the end of the study (week 31) were tested for bactericidal activity against strain H44/76 (B:15:P1:7,16) and the corresponding PorA-negative mutant. Titres are expressed as the final serum dilution that resulted in a ≥50% reduction in surviving CFU and are the mean of two independent experiments.