Table 1.
Mean microbial counts (log CFU/cm 2 ) of microbial groups isolated from paper currencies in Jimma town, southwest Ethiopia
| PCD | Sample size | AMB | Staph. | Enterob. | Coliforms | ABS | Yeasts | Molds |
|---|---|---|---|---|---|---|---|---|
| Mean ± SD | Mean ± SD | Mean ± SD | Mean ± SD | Mean ± SD | Mean ± SD | Mean ± SD | ||
| 1 | 20 | 7.65 ± 0.53a | 6.03 ± 3.14c | 4.13 ± 3.47e | 4.41 ± 3.00g | 5.06 ± 3.45i | 0.89 ± 1.24k | 0.51 ± 1.05m |
| 5 | 20 | 6.83 ± 0.96a | 4.90 ± 3.72c | 3.25 ± 2.38e | 3.26 ± 2.35g | 3.65 ± 2.77i | 0.25 ± 0.78k | 0.25 ± 0.76m |
| 10 | 20 | 7.68 ± 0.59b | 6.31 ± 3.26c | 5.00 ± 3.37e | 4.09 ± 3.44g | 5.24 ± 3.17i | 0.63 ± 1.12l | 0.38 ± 0.93m |
| 50 | 20 | 4.72 ± 0.11a | 2.78 ± 2.11d | 1.69 ± 1.37f | 1.64 ± 1.29h | 2.69 ± 2.19j | 0.26 ± 0.77k | 0.12 ± 0.55m |
| 100 | 20 | 4.66 ± 0.07a | 1.83 ± 1.19d | 1.64 ± 1.30f | 1.52 ± 1.15h | 2.28 ± 2.08j | 0.25 ± 0.76k | 0.13 ± 0.56m |
| Total | 100 | 6.32 ± 0.45 | 4.43 ± 2.68 | 3.14 ± 2.25 | 2.98 ± 2.25 | 3.78 ± 2.73 | 0.46 ± 0.94 | 0.28 ± 0.77 |
Where: PCD = Paper Currency Denominations, AMB = Aerobic Mesophilic Bacteria, Staph. = Staphylococci, Enterob. = Enterobacteriaceae, ABS = Aerobic Bacterial Spore, SD = Standard deviation. Similar superscripts within the same column indicate absence statistically significant differences among the mean values. Mean with different superscript is statistically significant from the others.