Table 3.
Results from protocol 2- residual sanitizer efficacy
| Countertop | Organism | CFU recovered from control samples* | Lot | CFU recovered from test samples | % reduction** |
|---|---|---|---|---|---|
| Test 1- Initial |
S. aureus |
1.3 × 106 |
1 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
| 2 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|||
| 3 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|||
|
E. aerogenes |
1.1 × 106 |
1 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|
| 2 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|||
| 3 |
390;<1.5;<1.5;<1.5 |
>99.9 |
|||
|
MRSA |
7.5 × 105 |
1 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|
| 2 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|||
|
P. aeruginosa |
1.3 × 106 |
1 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|
| 2 |
<1.5;<1.5;<1.5;90 |
>99.9 |
|||
|
E. coli 0157:H7 |
1.1 × 106 |
1 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|
| 2 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|||
| Test 1- Final |
S. aureus |
1.1 × 106 |
1 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
| 2 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|||
| 3 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|||
|
E. aerogenes |
1.2 × 106 |
1 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|
| 2 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|||
| 3 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|||
|
MRSA |
6.9 × 105 |
1 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|
| 2 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|||
|
P. aeruginosa |
2.0x106 |
1 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|
| 2 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|||
|
E. coli 0157:H7 |
9.4 × 105 |
1 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|
| 2 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|||
| Test 2- Initial |
S. aureus |
1.3 × 106 |
1 |
4.5;<1.5;<1.5;<1.5 |
>99.9 |
| 2 |
<1.5;<1.5;<1.5;200 |
>99.9 |
|||
| 3 |
<1.5;<1.5;<1.5;240 |
>99.9 |
|||
|
E. aerogenes |
1.1 × 106 |
1 |
<1.5;60;180;<1.5 |
>99.9 |
|
| 2 |
9;150;420;<1.5 |
>99.9 |
|||
| 3 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|||
|
MRSA |
7.6 × 105 |
1 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|
| 2 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|||
|
P. aeruginosa |
1.3 × 106 |
1 |
150;<1.5;9;230 |
>99.9 |
|
| 2 |
450;570;<1.5;<1.5 |
>99.9 |
|||
|
E. coli 0157:H7 |
1.1 × 106 |
1 |
<1.5;60;180;<1.5 |
>99.9 |
|
| 2 |
90;150;420;<1.5 |
>99.9 |
|||
| Test 2- Final |
S. aureus |
1.1 × 106 |
1 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
| 2 |
<1.5;330;<1.5;<1.5 |
>99.9 |
|||
| 3 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|||
|
E. aerogenes |
1.2 × 106 |
1 |
380;<1.5;<1.5;<1.5 |
>99.9 |
|
| 2 |
<1.5;<1.5;<1.5;320 |
>99.9 |
|||
| 3 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|||
|
MRSA |
6.9 × 105 |
1 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|
| 2 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|||
|
P. aeruginosa |
2.0 × 106 |
1 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|
| 2 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|||
| E. coli 0157:H7 | 9.4 × 105 | 1 |
<1.5;<1.5;<1.5;<1.5 |
>99.9 |
|
| 2 | <1.5;<1.5;<1.5;<1.5 | >99.9 |
*Values taken from Table 1.
**Compared to control, each number represents an average of 4 replicates per manufacturing lot. Either 2 or 3 lots were examined per organism.