Table 1 Effect of dead bacteria on bacterial growth of periodontal pathogens.

From: Necrotrophic growth of periodontopathogens is a novel virulence factor in oral biofilms

Living Bacteria

Dead bacteria

Final Log10 (CFU/mL)

P. intermedia

109 P. intermedia

9.48 ± 0.03*

108 P. intermedia

8.68 ± 0.04*

107 P. intermedia

8.13 ± 0.07*

Control (without dead P. intermedia)

8.02 ± 0.03*

109 P. gingivalis

9.84 ± 0.18*

108 P. gingivalis

9.48 ± 0.13*

107 P. gingivalis

9.22 ± 0.01*

Control (without dead P. gingivalis)

8.90 ± 0.04*

109 S. oralis

9.37 ± 0.02*

108 S. oralis

9.28 ± 0.09*

107 S. oralis

9.24 ± 0.07*

Control (without dead S. oralis)

9.13 ± 0.09*

109 F. nucleatum

9.46 ± 0.04*

108 F. nucleatum

9.43 ± 0.02*

107 F. nucleatum

9.37 ± 0.01*

Control (without dead F. nucleatum)

9.34 ± 0.02*

109 S. gordonii

9.43 ± 0.05*

108 S. gordonii

9.36 ± 0.04*

107 S. gordonii

9.35 ± 0.06*

Control (without dead S. gordonii)

9.32 ± 0.04*

109 P. gingivalis + 1 in 10 BHI

6.42 ± 0.10*

Control 1 in 10 BHI (without dead P. gingivalis)

4.65 ± 0.62*

P. gingivalis

109 P. gingivalis

9.10 ± 0.08*

108 P. gingivalis

9.06 ± 0.10*

107 P. gingivalis

8.94 ± 0.05*

Control (without dead P. gingivalis)

8.78 ± 0.04*

F. nucleatum

109 F. nucleatum

8.59 ± 0.03*

108 F. nucleatum

8.48 ± 0.06*

107 F. nucleatum

8.45 ± 0.08*

Control (without dead F. nucleatum)

8.38 ± 0.06*

  1. Data represent the final cell concentration of living periodontal pathogens (Log10 CFU/mL)after 24 anaerobic incubation starting from 7.7 Log10 CFU/mL and in presence of different concentrations of dead bacteria (mean ± standard deviation, n = 3). Control contains only living bacteria without addition of dead bacteria. *Statistically significant difference of periodontal pathogens concentration in presence of dead bacteria respect to the control (p < 0.05).
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