TABLE 3.

Bactericidal activity of carrier sera against a meningococcal PorA-negative straina

Student no.Titer against strain H44/76
PorA+PorA
932,0008,000
158,0008,000
305,6004,000
37132,00032,000
388,0008,000
  • 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.