Laboratory Medicine ›› 2021, Vol. 36 ›› Issue (12): 1258-1263.DOI: 10.3969/j.issn.1673-8640.2021.012.013

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Evaluation of 2 blood cultures' performance with different antibiotic adsorption materials in detecting pathogens on BacT/ALERT system

ZHENG Xin, HUANG Qi, XING Shan, TAN Xiaoli, DAI Shuqin, LIU Wanli, LIU Xiaomin()   

  1. Department of Clinical Laboratory,Sun Yat-sen University Cancer Center,State Key Laboratory of Oncology in South China,Collaborative Innovation Center for Cancer Medicine,Guangzhou 510060,Guangdong,China
  • Received:2020-10-08 Online:2021-12-30 Published:2021-12-29
  • Contact: LIU Xiaomin

Abstract:

Objective To compare and evaluate the ability to detect pathogens between blood culture bottles of new antibiotic adsorption materials and those of activated carbon adsorption materials. Methods According to the common bacterial distribution of Sun Yat-sen University Cancer Center,18 selected isolates(clinical isolates and ATCC standard isolates) were chosen to simulate patients' samples with non-antibiotic treatment and antibiotic treatment including vancomycin,daptomycin,imipenem and piperacillin-tazobactam. Those samples were added into blood culture bottles of 2 different types of antibiotic adsorption materials to evaluate their positive rates and detection times in BacT/ALERT system. Results Blood cultures of new antibiotic adsorption material and activated carbon adsorption material showed 100% recovery on 18 pathogens,like Gram-positive and Gram-negative bacteria and yeast,except for Staphylococcus haemolyticus. The time to detection of 13 species of pathogens was faster in new antibiotic adsorption material when compared with activitied carbon adsorption material(P<0.05). The average time to detection in new antibiotic adsorption aerobic material was 0.72-68.24 h,which was faster than that in activated carbon adsorption aerobic material,while the time to detection of new antibiotic adsorption anaerobic material showed 0.48-14.48 h shorter than that of activated carbon adsorption anaerobic material in detecting pathogens. When specific antibiotic added,both new antibiotic adsorption materials showed 100% recovery to 3 pathogens,while the recovery in activated carbon adsorption materials was 33%. The average time to detection was ranged from 12.72 h to 18.08 h in new antibiotic adsorption aerobic material and from 11.76 h to 28.16 h in new antibiotic adsorption anaerobic material. Conclusions In the absence of antibiotic interference,blood cultures with different antibiotic adsorption materials show the same positive rate of target pathogen,and those of new antibiotic adsorption material have a shorter time to detection. In the presence of antibiotic interference,compared with the activated carbon adsorption material,the blood culture bottles of the new antibiotic adsorption material have a higher detection ability of pathogens.

Key words: Blood culture, Antibiotic adsorption, Pathogen, Positive detection rate, Time to detection

CLC Number: