TABLE 4.

Biocides which do not pass the European challenge test for planktonic S. aureus and P. aeruginosa

Organism and biocide	Concn (%)	Bacterial level (log10 CFU/ml) for untreated samplea	Biocidal activity (log10 RF) after contact time of:
			1 min	5 min	15 min	30 min	60 min
Staphylococcus aureus
Povidone-iodineb	10	6.45	4.62	≥5.45	≥5.45	≥5.45	≥5.45
Hydrogen peroxide	5	6.40	0.64	4.65	≥5.40	≥5.40	≥5.40
Nitrofurazoneb	0.2	6.48	0.01	0.01	0.01	0.01	0.02
Pseudomonas aeruginosa
Hydrogen peroxide	5	6.21	3.69	≥5.21	≥5.21	≥5.21	≥5.21
Nitrofurazoneb	0.2	5.83	0.28	0.41	1.02	1.92	2.83

^aResults for untreated samples represent the final bacterial levels after dilution with the test product and AD and after neutralization.

^bDue to in-test dilution, these commercially available products were tested at 80% of the mentioned dose.