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(a)
| Number of initially seeded bacteria | |||||
|---|---|---|---|---|---|
| PBS (neg. control) | 103 | 104 | 105 | 106 | |
| Number of initially seeded bacteria | |||||
| PBS (neg. control) | — | 0.000 | 0.000 | 0.000 | 0.024 |
| 103 | 0.000 | — | 0.815 | 0.770 | 0.009 |
| 104 | 0.000 | 0.815 | — | 0.806 | 0.002 |
| 105 | 0.000 | 0.770 | 0.806 | — | 0.002 |
| 106 | 0.024 | 0.009 | 0.002 | 0.002 | — |
