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Correlation of agr type and biofilm formation in collection of S. aureus clinical isolates from invasive infections. Biofilm formation was measured as A570. Mann-Whitney U test was used for statistical comparisons. p>0.05 was considered non-significant (n.s.).
| agr type | n | Biofilm formation [mean ± SEM] | p compared to other isolates |
|---|---|---|---|
| all typed | 159 | 1.9 ± 0.1 | - |
| agr I | 58 | 1.5 ± 0.1 | 0.003 |
| agr II | 39 | 1.6 ± 0.2 | n.s. |
| agr III | 53 | 2.6 ± 0.2 | <0.001 |
| agr IV | 9 | 1.6 ±0.4 | n.s. |
