Fig. 4
![Fig. 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12879-018-3576-9/MediaObjects/12879_2018_3576_Fig4_HTML.png)
Results of confocal scanning microscopy analysis. Data are expressed as mean ± standard deviation (n = 3). CTRL = untreated samples; + Sal/Sor = samples incubated with a mixture of S. salivarius and S. oralis by means of transwell inserts; sep = S. epidermidis; sau = S. aureus; spn = S. pneumoniae; spy = S. pyogenes; mxl = M. catarrhalis; pac = P. acnes; * P ≤ 0.05; ** P ≤ 0.01; *** P ≤ 0.001