From: Persistence of antibodies in laboratory staff immunized with quadrivalent meningococcal polysaccharide vaccine
PN
Serum bactericidal antibody titers
A
C
W135
Y
17
4,096 (16)
8,192 (−)
128 (32)
4,096 (1,024)
18
512 (256)
512 (8)
8,192 (4,096)
8,192 (1,024)
19
8,192 (128)
2,048 (128)
2,048 (1,024)
16,384 (64)