Table 2.

IgA antibody to UspA of M. catarrhalis in NPS of children

SubjectAge (mo.) at time ofa:IgA titera,b
NPS collectionColonizationTotal (μg/ml)Specific (ng/ml)
Noncolonized
 13.15, 80.5<5
 23.95, 6, 120.7<5
 34.110, 120.9<5
 45.204.7<5
 55.810, 121.2<5
 Mean ± SD4.4 ± 1.1a  1.6 ± 1.8c
Colonized
 14.13, 12136.8<5
 25.04, 5, 6, 8136.8<5
 35.234.7<5
 45.93, 4, 126.6<5
 56.122.4<5
 66.31, 8, 109.5<5
 76.43, 4, 5, 84.3<5
 86.62, 3, 4, 6, 83.3<5
 97.03, 4, 8, 1019.0<5
 108.31, 3, 5, 6, 8, 1053.2<5
 Mean ± SD6.1 ± 1.2b 37.7 ± 54.4d
  • a a versus b, P = 0.02; c versus d, P = 0.008.

  • b The ratio of specific to total IgA titer is zero for all cases because the specific titer is below the detection level.