Table 3. Proportionala resistance of highly resistant organisms by age,b San Francisco County, 1996 to 1999.
| Age group (years) | Methicillin-resistant (%) Staphylococcus aureus | Vancomycin-resistant (%) Enterococcus faecium | Penicillin- resistant (%) Streptococcus pneumoniae |
|---|---|---|---|
| ≤10 | 14.3 (98) | 22.2 (9) | 19.3 (83) |
| 10-19 | 8.1 (37) | 50.0 (4) | 20.0 (5) |
| 20-29 | 21.7 (83) | 50.0 (8) | 0 (26) |
| 30-39 | 17.6 (250) | 42.1 (19) | 13.4 (142) |
| 40-49 | 21.8 (353) | 41.4 (29) | 8.7 (138) |
| 50-59 | 24.8 (234) | 43.8 (32) | 11.5 (78) |
| 60-69 | 29.1 (227) | 45.5 (44) | 10.2 (49) |
| 70-79 | 24.8 (258) | 55.9 (34) | 15.6 (64) |
| ≥80 | 22.8 (237) | 41.2 (17) | 17.2 (64) |
aProportional resistance refers to the proportion of isolates of that species that is resistant to the indicated antibiotic.
bTotal number of species isolates given in parentheses. Percentages for small numbers of total isolates should be cautiously interpreted.