TABLE 1.
Colony counts of strains tested on four different blood agar plates
| Strain and dilutiona | Colony counts on blood agar plates (range for triplicate plates)
|
|||
|---|---|---|---|---|
| HBA | CSBA | DSBA | HuBA | |
| S. pneumoniae ATCC 6305 | ||||
| 1.4 × 103 | >100 | >100 | >100 | >100 |
| 1.4 × 104 | >1,000 | >1,000 | >1,000 | >1,000 |
| 1.5 × 102 in CSF | ∼100 | ∼100 | ∼100 | ∼100 |
| 1.1 × 104 in CSF | >1,000 | >1,000 | >1,000 | >1,000 |
| S. pneumoniae ATCC 49619 | ||||
| 2.1 × 103 | >100 | >100 | >100 | >100 |
| 2.1 × 104 | >1,000 | >1,000 | >1,000 | >1,000 |
| 1.6 × 102 in CSF | ∼100 | ∼100 | ∼100 | ∼100 |
| 1.6 × 104 in CSF | >1,000 | >1,000 | >1,000 | >1,000 |
| S. aureus ATCC 25923 | ||||
| 2 × 102 | 18-21 | 22-29 | 22-32 | 13-32 |
| 2 × 104 | >1,000 | >1,000 | >1,000 | >1,000 |
| 1.1 × 102 in CSF | ∼100 | ∼100 | ∼100 | ∼100 |
| 1.1 × 104 in CSF | >1,000 | >1,000 | >1,000 | >1,000 |
| S. aureus ATCC 29213 | ||||
| 2.5 × 102 | 18-38 | 9-21 | 24-28 | 9-14 |
| 2.5 × 104 | >1,000 | >1,000 | >1,000 | >1,000 |
| 1.6 × 102 in CSF | ∼100 | ∼100 | ∼100 | ∼100 |
| 1.6 × 104 in CSF | >1,000 | >1,000 | >1,000 | >1,000 |
| S. pyogenes ATCC 19615 | ||||
| 7 × 101 | 6-8 | 6-22 | 8-24 | 1-14 |
| 7 × 103 | >100 | >100 | >100 | >100 |
| 1 × 102 in CSF | ∼100 | ∼100 | ∼100 | ∼100 |
| 1 × 104 in CSF | >100 | >100 | >100 | >100 |
| S. pyogenes strain JC20 | ||||
| 1.2 × 102 | 6-16 | 2-15 | 2-13 | 12-15 |
| 1.2 × 104 | >1,000 | >1,000 | >1,000 | >1,000 |
| 4.5 × 101 in CSF | 14-20 | 7-10 | 10-12 | 2-6 |
| 4.5 × 103 in CSF | >100 | ∼100 | ∼100 | 70 |
a
Results are presented for the upper and the lower dilutions only. In many cases (e.g., for all S. aureus and S. pyogenes strains) intermediate dilutions were also tested, with identical results for each agar. A clinical isolate of S. pneumoniae and a clinical isolate of S. aureus were also tested (results not shown).