Table 5.

Microbiological findings in a healthy working population (historical control group, n = 100)

Microbiological findings	Frequency (%)
Candida spp.	37
Streptococcus viridans	11
Escherichia coli	5
Klebsiella pneumoniae	5
Enterococcus faecalis	5
Neisseria species	4
Staphylococcus aureus	3
Coagulase-negative staphylococci	6
Pseudomonas aeruginosa	1
Moraxella catarrhalis	4
Streptococcus pneumoniae	3
Serratia marcescens	1
Group A streptococci	3

An abnormal bacterial spectrum was defined as quantitative alterations of otherwise physiologically colonizing bacteria of the oral cavity and/or evidence of non-physiological bacteria