Table 1. Concentrations of Bacteria (E. coli And Enterococci) on Objects Used in the Exposure Model.
| Microbiological Sampling a , b | Values Adjusted for Sampling Efficiency a , c | |||||
|---|---|---|---|---|---|---|
| Source | Fomite (Material) | E. coli | Enterococci | E. coli | Enterococci | Corresponding Object Categories |
| Participant A | Floor (Soil) | > 500 | 280 | 2500 | 1400 | Dirt or Sand |
| Broom (Wood) | 7.5 | < 2.5 | 37.5 | 12.5 | Wooden Broom | |
| Bucket (Plastic) | 2.5 | < 2.5 | 12.5 | 12.5 | Metal Bucket, Plastic Objects, Metal Utensils | |
| Bag (Burlap) | 150 | 70 | 750 | 350 | Burlap Sack | |
| Clothing (Cloth) | < 2.5 | 2.5 | 12.5 | 12.5 | Clothing | |
| Participant B | Plate (Plastic) | > 500 | 58 | 2500 | 290 | Food Scraps |
| Stool (Wood) | 65 | 7.5 | 325 | 37.5 | Wooden Door, Wooden Objects | |
| Tool Handle (Rubber) | < 2.5 | < 2.5 | 12.5 | 12.5 | Rubber | |
| Clothing (Cloth) | < 2.5 | 2.5 | 12.5 | 12.5 | Clothing | |
| Bucket (Plastic) | 70 | 10 | 350 | 50 | Metal Bucket, Plastic Objects, Metal Utensils | |
| Assumptions d | Assumed Contaminated | DNM | DNM | 12.5 | 12.5 | Charcoal, Their Own Face, Money, Stone |
| Assumed Clean | DNM | DNM | 0 | 0 | Not in View, Nothing, Paper Towels, Bar Soap, Washing Clothes, Washing Hands, Water Used for Drinking, Water Used for Hand Sampling | |
DNM, did not measure.
aConcentrations expressed in units of CFU/100 cm2 or CFU/100 ml.
bRefers to concentrations recovered from objects
cRefers to surface concentration used in the exposure model by adusting measurements to account for a sampling efficiency of 20%.
dRefers to object categories that were not similar to any fomites tested; for these objects either no contamination (0 CFU/100 cm2 or 0 CFU/100 ml) or the lower limit of detection (12.5) was assumed.