TABLE 2.

MAID versus Focus ELISA: qualitative reactivity patterns for 220 consecutive sera submitted for B. pertussis antibody testing

Reactivity patternNo. of sera exhibiting the indicated reactivity pattern for:Total
PT IgGPT IgAFHA IgGFHA IgA
Concordant normal191195174186746
Concordant increased2612312190
MAID increased, ELISA normal01011122
MAID normal, ELISA increased3314222
Total (%) concordant217 (99)207 (94)205 (93)207 (94)836 (95)
Total (%) discordant3 (1)13 (6)15 (7)13 (6)44 (5)