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. 2021 Jan 9;21:21. doi: 10.1186/s12866-020-02082-1

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 5 — Correlation analyses of A. baumannii virulence phenotypes. a Analysis of motility phenotypes from A. baumannii strains isolated from various sources reveals A. baumannii isolated from wounds has significantly higher motility than those isolated from sputum, bronchial wash, blood (P< 0.01, One-Way ANOVA) or urine and Foley catheter (P< 0.05, One-Way ANOVA). Bars indicate mean values of all strains isolated from the source (+/− standard error mean error bars) with individual measurements for each strain indicated by discrete points (n=4 biological replicates). b Analysis of biofilm formation on polystyrene by A. baumannii strains isolated from various sources reveals A. baumannii strains isolated from blood have significantly higher biofilm to biomass ratio than those isolated from sputum or bronchial wash (P< 0.05, One-Way ANOVA) or wounds (P< 0.01, One-Way ANOVA). Bars indicate mean values of all strains isolated from the source (+/− standard error mean error bars) with individual measurements for each strain indicated by discrete points (n=4 biological replicates). c Both Spearman’s and Pearson’s correlation analyses reveal an inverse relationship between biofilm formation and motility (Pearson’s R2= 0.2480 with a 95% confidence interval of − 0.7896 to − 0.02284, P=0.0419, Spearman’s R= − 0.5270 with a 95% confidence interval of − 0.8094 to − 0.04668, P=0.0153). d Spearman’s correlation analysis reveals an inverse relationship between motility and hemolysis (Spearman’s R=-0.4496 with a 95% confidence interval of − 0.7713 to 0.05499, P=0.0153)