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Chinese Journal of Experimental and Clinical Infectious Diseases(Electronic Edition) ›› 2021, Vol. 15 ›› Issue (01): 67-71. doi: 10.3877/cma.j.issn.1674-1358.2021.01.011

Special Issue:

• Research Article • Previous Articles     Next Articles

Relationship between the biofilm formation ability of Acinetobacter baumannii and biofilm related genes, drug resistance

Fenghua Luo1, Jianlin Wei2,()   

  1. 1. Department of Clinical Laboratory, Nanchong Central Hospital Jialing Branch, Nanchong Jialing People’s Hospital, Nanchong 637000, China
    2. Department of Clinical Laboratory, Nanchong Central Hospital, Nanchong 637000, China
  • Received:2020-02-19 Online:2021-02-15 Published:2021-03-29
  • Contact: Jianlin Wei

Abstract:

Objective

To investigate the relationship between biofilm formation ability of Acinetobacter baumannii (A. baumannii) clinical isolated and biofilm related genes, drug resistance.

Methods

Total of 40 strains of A. baumannii clinical isolates were collected from Nanchong Jialing District People’s Hospital from January to June, 2018. The minimum inhibitory concentration (MIC) of 13 kinds of common antibiotics were determined by Vitek-2 Automatic Microorganism System. The biofilm formation ability was determined by crystal violet staining. The biofilm related genes abaI, bap, BLP1 and BLP2 were detected by PCR. The biofilm related genes and drug resistance of different biofilm formation ability were analyzed by Fisher exact probability method.

Results

Seven (17.5%) multi-drug resistant (MDR) strains and 14 (35.0%) extensively drug resistant (XDR) strains were detected among the 40 clinical isolates. Total of 31 (77.5%) strains exhibitted biofilm formation. The positive ratios of abaI, bap, BLP1 and BLP2 gene were 85.00%, 62.50%, 5% and 17.5%, respectively. The resistance of A. baumannii with different biofilm formation ability to piperacillin/tazobactam was significantly different (P = 0.046). The resistance rates of A. baumannii strains with strong biofilm formation to piperacillin, ceftazidime, cefoperazone, cefoperazone/sulbactam, imipenem, meropenem, amikacin, levofloxacin, doxycline, compound sulfamethoxazole were lower than those of weak positive strains and negative strains, but with no significant differences (all P > 0.05) The biofilm formation ability of isolates with BLP2 gene were statistically different (P = 0.039), but the biofilm formation ability were not significantly different of iaolates with abaI (P = 0.455), bap (P = 0.058) and BLP1 genes (P = 1.000), respectively.

Conclusions

The sensitivity of A. baumannii to antibiotics could be changed by biofilm formation, which was related to biofilm formation and BLP2 gene, piperacillin/tazobactam resistance.

Key words: Acinetobacter baumannii, Biofilm, Gene

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