Table 4.

Results of follow-up analysis after accomplishment of decontamination measures in dental units that had revealed microbial contamination during periodical analysis. A total of 34 paired samples that collected prior to and after the first intervention were compared

	DUW with contamination during periodical monitoring	DUW without contamination upon follow-up	Success rate of intervention (%)
Legionella contamination*	23	15	65.2
Pseudomonas contamination*	2	1	50.0
Increased total colony count$	11	8	72.7
* ≥1 cfu/100 ml
$ ≥100 cfu/ml