Fengjuan Li1, Wenqing Wang2, Zhaoqin Zhu3, Aiping Chen4, Pengcheng Du1, Ruibai Wang1, Haili Chen3, Yunwen Hu3, Jie Li1, Biao Kan5, Duochun Wang6. 1. National Institute for Communicable Disease Control and Prevention, China CDC /State Key Laboratory for Infectious Disease Prevention and Control, Beijing, China; Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Hangzhou, China. 2. CDC of Pudong New Area, Shanghai, China. 3. Shanghai Public Health Clinical Center, Fudan University, Shanghai, China. 4. CDC of Fujian Province, Fuzhou, China. 5. National Institute for Communicable Disease Control and Prevention, China CDC /State Key Laboratory for Infectious Disease Prevention and Control, Beijing, China; Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Hangzhou, China. Electronic address: kanbiao@icdc.cn. 6. National Institute for Communicable Disease Control and Prevention, China CDC /State Key Laboratory for Infectious Disease Prevention and Control, Beijing, China; Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Hangzhou, China. Electronic address: wangduochun@icdc.cn.
Abstract
OBJECTIVES: To determine the prevalence of Aeromonas infections in diarrheal patients, the distribution of virulence-associated genes and antibiotic resistance among different Aeromonas species in China. METHODS: We conducted continual active surveillance aimed on Aeromonas from diarrheal patients and aquatic samples. Aeromonas strains were identified by biochemical tests, further confirmed to species level by a multilocus phylogenetic analysis. Potential virulence genes were detected by PCR. Antibiotics susceptibility testing was carried based on the minimal inhibitory concentration. RESULTS: From 5069 samples (stool specimens, n = 4529; water samples, n = 540) in China, 257 Aeromonas isolates [stools, n = 193 (4.3%); water, n = 64 (11.9%)] were identified by biochemical tests. The most common species from stools and water were Aeromonas veronii (42.5%) and Aeromonas caviae (37.5%), respectively. Distribution of five potential genes were significantly different between stool and water samples, two genes (ast and alt) were higher in stool than in water samples (P < 0.01). Meanwhile, three species (A. veronii, A. caviae and Aeromonas aquariorum) account for the six most prevalent combination patterns of potential genes. Furthermore, strains resistant to nine antibiotics was markedly higher in strains isolated from water than those from stools (P ≤ 0.003); in contrast, resistance to only two antibiotics was higher in strains isolated from stools compared to those from water. In addition, strains containing multiple antibiotic resistance (MAR) from stools (8.6%; 16/187) and water (30.2%; 19/63) were resistant to ten or more antibiotics. CONCLUSION: Our study highlights the multiple factors involved in the pathogenesis of Aeromonas and reveals that environmental Aeromonas has acquired a wide range of MAR compared to those from clinical sources.
OBJECTIVES: To determine the prevalence of Aeromonas infections in diarrhealpatients, the distribution of virulence-associated genes and antibiotic resistance among different Aeromonas species in China. METHODS: We conducted continual active surveillance aimed on Aeromonas from diarrhealpatients and aquatic samples. Aeromonas strains were identified by biochemical tests, further confirmed to species level by a multilocus phylogenetic analysis. Potential virulence genes were detected by PCR. Antibiotics susceptibility testing was carried based on the minimal inhibitory concentration. RESULTS: From 5069 samples (stool specimens, n = 4529; water samples, n = 540) in China, 257 Aeromonas isolates [stools, n = 193 (4.3%); water, n = 64 (11.9%)] were identified by biochemical tests. The most common species from stools and water were Aeromonas veronii (42.5%) and Aeromonas caviae (37.5%), respectively. Distribution of five potential genes were significantly different between stool and water samples, two genes (ast and alt) were higher in stool than in water samples (P < 0.01). Meanwhile, three species (A. veronii, A. caviae and Aeromonas aquariorum) account for the six most prevalent combination patterns of potential genes. Furthermore, strains resistant to nine antibiotics was markedly higher in strains isolated from water than those from stools (P ≤ 0.003); in contrast, resistance to only two antibiotics was higher in strains isolated from stools compared to those from water. In addition, strains containing multiple antibiotic resistance (MAR) from stools (8.6%; 16/187) and water (30.2%; 19/63) were resistant to ten or more antibiotics. CONCLUSION: Our study highlights the multiple factors involved in the pathogenesis of Aeromonas and reveals that environmental Aeromonas has acquired a wide range of MAR compared to those from clinical sources.
Authors: Rafael Bastos Gonçalves Pessoa; Weslley Felix de Oliveira; Maria Tereza Dos Santos Correia; Adriana Fontes; Luana Cassandra Breitenbach Barroso Coelho Journal: Front Microbiol Date: 2022-05-31 Impact factor: 6.064