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Colony Forming Unit Assay.
| S. gordonii | S. intermedius | S. mitis | S. oralis | |
|---|---|---|---|---|
| PBS | +++ | +++ | +++ | +++ |
| Flavorless E-liquid | ++ | +++ | +++ | ++ |
| Tobacco | + | + | ++ | ++ |
| Menthol | − | − | − | − |
| Cinnamon | − | − | − | − |
| Strawberry | − | − | − | − |
| Blueberry | − | − | − | − |
Each assay consisted of n = 4 and the amount of CFUs was visually ranked as follows: +++ bacterial lawns; ++ too many to count; + countable colonies; − growth was not detected.
