TABLE 2.
Antibody levels in individuals before and after 65 years of age
| Antigen | Level [median (SEMa)] at age: |
P value | |
|---|---|---|---|
| <65 yr (n = 78) | >65 yr (n = 73) | ||
| Surface antigens | |||
| Teichoic acid | 606 (76) | 436 (98) | 0.058 |
| ClfA | 140 (23) | 117 (23) | 0.299 |
| ClfB | 229 (28) | 116 (22) | 0.0006 |
| Bsp | 195 (35) | 165 (37) | 0.215 |
| Extracellular proteins | |||
| Alpha toxin | 160 (18) | 204 (28) | 0.089 |
| Lipase | 268 (39) | 179 (33) | 0.056 |
| SEA | 324 (41) | 282 (54) | 0.049 |
| TSST | 336 (115) | 623 (91) | 0.18 |
| SSS | 174 (72) | 139 (96) | 0.444 |
| Efb | 435 (44) | 430 (46) | 0.878 |
| Eap | 218 (56) | 134 (42) | 0.210 |
a
SEM, standard error of the mean.