Based on these results, which of the following statements is true regarding the effectiveness of this disinfectant against this bacterium? The disinfectant is bacteriostatic at 1:4 dilution. The disinfectant is bacteriostatic at 1:2 dilution. The disinfectant is NOT bacteriostatic at any of the dilutions tested. The disinfectant is bacteriostatic at 1:8 dilution. The disinfectant is bacteriostatic at 1:16 dilution.
A new chemical disinfectant was tested for activity against Staphylococcus growth. The bacteria were incubated in bacterial growth medium + disinfectant for 24 hours, then one loopful of the mixture was transferred to fresh medium without the disinfectant (subculturing) and incubating the subculture. The initial culture and subcultures were evaluated for growth after incubation. (+ = growth; - = no growth)
| Dilution | Initial | Subculture |
| 1:2 | - | - |
| 1:4 | - | - |
| 1:8 | - | + |
| 1:16 | + | + |
| 1:32 | + | + |
Based on these results, which of the following statements is true regarding the effectiveness of this disinfectant against this bacterium?
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The disinfectant is bacteriostatic at 1:4 dilution. |
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The disinfectant is bacteriostatic at 1:2 dilution. |
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The disinfectant is NOT bacteriostatic at any of the dilutions tested. |
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The disinfectant is bacteriostatic at 1:8 dilution. |
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The disinfectant is bacteriostatic at 1:16 dilution.
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