Analysis of adult damselfly fecal material aids in the estimation of antibiotic-resistant Enterobacterales contamination of the local environment

PeerJ

article

Yuyu Yamaguchi¹  Torahiko Okubo²  Mizue Matsushita²  Masashi Wataji¹  Sumio Iwasaki³  Kasumi Hayasaka³  Kouzi Akizawa³  Junji Matsuo²  Chikara Shimizu³  Hiroyuki Yamaguchi² 

[1] Hokkaido Sapporo Asahigaoka Senior High School;Department of Medical Laboratory Science, Faculty of Health Sciences, Hokkaido University;Hokkaido University Hospital

关键词: Antibiotic-resistant bacteria;    Fecal material;    Damselfly;    Sapporo;    Local environments;    Enterobacterales;   

DOI  :  10.7717/peerj.5755

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

Because damselflies are ubiquitously but focally present in natural environments and play a critical role as predators of other insect species, the fecal matter of damselflies may be useful for investigating antibiotic-resistant bacterial populations, including human pathogens, in local environments. We therefore examined the prevalence of antibiotic-resistant bacteria, including Enterobacterales, in fecal material from 383 damselflies (adults and larvae) collected from seven locations around Sapporo City, Japan, in 2016 and 2017. Fecal samples were plated on soybean casein digest (SCD) agar plates with and without antibiotics (SCD-A and SCD-w/o, respectively) to identify environmental bacteria and gut bacteria, respectively, and on MacConkey agar plates with antibiotics (MacConkey-A) to select for Gram-negative bacteria, including human pathogenic Enterobacterales species. The prevalence of colonies on each of the plates was compared, and representative colonies on MacConkey-A plates were identified to the species level using an API 20E kit and the MALDI Biotyper system. Overall, SCD-w/o plates showed a gut bacterial load of approximately 108 colony-forming units per adult damselfly or larva. There was a significant difference between the prevalence of colonies on the SCD-A and MacConkey-A plates, and a significantly increased prevalence of antibiotic-resistant bacteria on MacConkey-A plates was observed in samples collected from Shinoroshinkawa. Cluster analysis based on minimum inhibitory concentration values of 59 representative isolates from MacConkey-A agar plates revealed that samples from Shinoroshinkawa contained a higher prevalence of Enterobacterales than those from other sampling locations. Thus, fecal materials discharged by adult damselflies could be used in future studies as a simple tool for estimating antibiotic-resistant bacteria, including Enterobacterales species, in the local environment.

【 授权许可】

CC BY