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Number and percentage of β-lactamase producing H. influenzae isolates, by year
| Year | No. of participating labs | No. (%) of isolates
|
|
|---|---|---|---|
| Total | Producing β-lactamase | ||
| 1993 | 7 | 5,750 | 1,901 (33) |
| 1994 | 7 | 5,426 | 1,691 (31) |
| 1995 | 7 | 8,306 | 3,105 (37) |
| 1996 | 7 | 8,646 | 3,298 (38) |
| 1997 | 17 | 16,563 | 5,643 (34) |
| Total | 17 | 44,691 | 15,638 (35) |
