Effects of biochar on reducing the abundance of oxytetracycline, antibiotic resistance genes, and human pathogenic bacteria in soil and lettuce

2017 ◽  
Vol 224 ◽  
pp. 787-795 ◽  
Author(s):  
Manli Duan ◽  
Haichao Li ◽  
Jie Gu ◽  
Xiaxia Tuo ◽  
Wei Sun ◽  
...  
Keyword(s):  
Antibiotic Resistance ◽  
Resistance Genes ◽  
Pathogenic Bacteria ◽  
Antibiotic Resistance Genes ◽  
Human Pathogenic Bacteria

scholarly journals COVID-19 Lockdowns May Reduce Resistance Genes Diversity in the Human Microbiome and the Need for Antibiotics

2021 ◽  
Vol 22 (13) ◽  
pp. 6891
Author(s):  
João S. Rebelo ◽  
Célia P. F. Domingues ◽  
Francisco Dionisio ◽  
Manuel C. Gomes ◽  
Ana Botelho ◽  
...  
Keyword(s):  
Antibiotic Resistance ◽  
Resistance Genes ◽  
Pathogenic Bacteria ◽  
Bacterial Resistance ◽  
Human Microbiome ◽  
Antibiotic Resistance Genes ◽  
Public Health Problem ◽  
Small World ◽  
Physical Contact ◽  
Hygiene Measures

Recently, much attention has been paid to the COVID-19 pandemic. Yet bacterial resistance to antibiotics remains a serious and unresolved public health problem that kills hundreds of thousands of people annually, being an insidious and silent pandemic. To contain the spreading of the SARS-CoV-2 virus, populations confined and tightened hygiene measures. We performed this study with computer simulations and by using mobility data of mobile phones from Google in the region of Lisbon, Portugal, comprising 3.7 million people during two different lockdown periods, scenarios of 40 and 60% mobility reduction. In the simulations, we assumed that the network of physical contact between people is that of a small world and computed the antibiotic resistance in human microbiomes after 180 days in the simulation. Our simulations show that reducing human contacts drives a reduction in the diversity of antibiotic resistance genes in human microbiomes. Kruskal–Wallis and Dunn’s pairwise tests show very strong evidence (p < 0.000, adjusted using the Bonferroni correction) of a difference between the four confinement regimes. The proportion of variability in the ranked dependent variable accounted for by the confinement variable was η2 = 0.148, indicating a large effect of confinement on the diversity of antibiotic resistance. We have shown that confinement and hygienic measures, in addition to reducing the spread of pathogenic bacteria in a human network, also reduce resistance and the need to use antibiotics.

scholarly journals Monitoring and Evaluation of Antibiotic Resistance Genes in Three Rivers in Northeast China

2021 ◽  
Author(s):  
Chen Zhao ◽  
Chenyu Li ◽  
Xiaoming Wang ◽  
Zhuosong Cao ◽  
Chao Gao ◽  
...  
Keyword(s):  
Antibiotic Resistance ◽  
River Water ◽  
Resistance Genes ◽  
Northeast China ◽  
Pathogenic Bacteria ◽  
Respiratory Infections ◽  
Antibiotic Resistance Genes ◽  
Distribution Characteristics ◽  
Beta Lactam ◽  
Three Rivers

Abstract Background: Antibiotic resistance genes (ARGs) have become an important public health problem. In this study, we used metagenomic sequencing to analyze the composition of ARGs in certain original habitats of northeast China, comprising three different rivers and riverbank soils of the Heilongjiang River, Tumen River, and Yalu River. Results: Twenty types of ARG were detected in every water sample. The major ARGs were multidrug resistance genes, at approximately 0.5 copies/16s rRNA, accounting for 57.5% of the total ARG abundance. The abundance of multidrug, bacitracin, beta-lactam, macrolide‑lincosamide‑streptogramin, sulfonamide, fosmidomycin, and polymyxin resistance genes covered 96.9% of the total ARG abundance. No significant ecological boundary of ARG diversity was observed. The compositions of the resistance genes in the three rivers were very similar to each other, and 92.1% of ARG subtypes were shared by all water samples. Except for vancomycin resistance genes, almost all ARGs in riverbank soils were detected in the river water. About 31.05% ARGs were carried by Pseudomonas. Opportunistic pathogenic bacteria carrying resistance genes were mainly related to diarrhea and respiratory infections. Multidrug and beta-lactam resistance genes correlated positively with mobile genetic elements (MGEs), indicating a potential risk of diffusion.Conclusions: The composition of ARGs in three different rivers was similar, indicating that climate played an important role in ARG occurrence. ARG subtypes in river water were almost completely the same as those in riverbank soil. ARGs had no significant geographical distribution characteristics. Many ARGs were carried by human pathogenic bacteria related to human diarrhea and respiratory infections, such as Pseudomonas aeruginosa and Aeromonas caviae. In general, our results provide a valuable dataset of river water ARG distribution in northeast China. The related ecological geography distribution characteristics should be further explored.

Genome Assessment of Antibiotic Resistance Genes in Probiotic Bacteria and a Literature Review

2021 ◽  
Author(s):  
Mehdi Fatahi-Bafghi ◽  
Sara Naseri ◽  
Ali Alizehi
Keyword(s):  
Antibiotic Resistance ◽  
Genome Sequence ◽  
Resistance Genes ◽  
Pathogenic Bacteria ◽  
Antibiotic Resistance Genes ◽  
Probiotic Bacteria ◽  
Whole Genome Sequence ◽  
Probiotic Properties ◽  
Antibiotic Resistant ◽  
To Come

Abstract Having various clinical applications, probiotic bacteria are currently used in the diet. There are reports of antibiotic resistance genes (ARGs) in these bacteria that can be transferred to other microflora and pathogenic bacteria. The aim of the study is to examine whole-genome sequence analysis in bacteria with probiotic properties. Moreover, this study follows existing issues about the importance and presence of ARGs in these bacteria the dangers of which may affect human health in the years to come. In the present study, 126 complete probiotic bacterial genomes were collected and analysed for ARGs. The results of the study shows there are various antibiotic resistant genes of in these bacteria some of which can be transmitted to other bacteria. We propose microorganisms be applied as a probiotic element in various types of products, antibiogram be conducted for a large number of antibiotics and analysis of complete genome sequence for ARGs prediction.

Metagenomic analysis of effects of oxytetracycline and copper on antibiotic resistance genes and associated pathogenic hosts in swine manure compost

2020 ◽  
Author(s):  
Honghong Guo ◽  
jie gu ◽  
Xiaojuan Wang ◽  
Zilin Song ◽  
Xun Qian ◽  
...  
Keyword(s):  
Antibiotic Resistance ◽  
Resistance Genes ◽  
Pathogenic Bacteria ◽  
Swine Manure ◽  
Antibiotic Resistance Genes ◽  
Feed Additives ◽  
Poultry Feed ◽  
Risk Scores ◽  
Composting Process ◽  
Positive Effects

Abstract Background: The proliferation of antibiotic resistance genes (ARGs) in compost and their horizontal transfer to human pathogenic bacteria (HPB) may lead to the failure of human antibiotics. However, the antibiotic resistome in compost has not been comprehensively characterized. This study used a metagenomic approach to obtain new insights into the effects of oxytetracycline (OTC) and copper (Cu) on the antibiotic resistome during swine manure composting and the risks posed to human health. Results: The results showed that composting reduced the abundances and diversity of ARGs and HPB in swine manure. In total, 289 ARG subtypes and 19 ARG types were detected in the samples with abundances ranging from 1.08 ´ 10 –1 to 9.39 ´ 10 –1 copies/16S rRNA, which mainly encoded tetracycline, aminoglycoside, and macrolide–lincosamide–streptogramin (MLS) resistance genes. The application of OTC and Cu, especially the combined application, exacerbated the compost resistome risk scores and specific ARG subtypes responded differently. Tetracycline, multidrug, and MLS resistance genes mainly affected resistance profiles of HPB throughout the composting process. HPB and intI1 had significant positive effects on determining the ARG profiles during the composting process, and the co-selective effect of heavy metals may increase the abundances of ARGs via strong positive effects on intI1 . In addition, the effect of mobile genetic elements on the horizontal gene transfer of ARGs should not be ignored. Conclusions: This study of the antibiotic resistome in compost indicates the need for effective regulation of the misuse of livestock and poultry feed additives in order to minimize the spread of the antibiotic resistome in agro-ecosystems and decrease the potential risk to public health. Keywords: Antibiotic resistome; Composting; Metagenome; Pathogenic host; Swine manure

scholarly journals Longitudinal assessment of antibiotic resistance gene profiles in gut microbiomes of infants at risk of eczema

2020 ◽  
Author(s):  
Evelyn Loo ◽  
Amanda Zain ◽  
Gaik Chin Yap ◽  
Rikky W Purbojati ◽  
Daniela I Drautz-Moses ◽  
...  
Keyword(s):  
Antibiotic Resistance ◽  
Cohort Study ◽  
Resistance Genes ◽  
Pathogenic Bacteria ◽  
Antibiotic Resistance Gene ◽  
Antibiotic Resistance Genes ◽  
Multidrug Resistant ◽  
First Year ◽  
Beta Lactam ◽  
First Year Of Life

Abstract Background While there is increasing knowledge about the gut microbiome, the factors influencing and the significance of the gut resistome are still not well understood. Infant gut commensals risk transferring multidrug-resistant antibiotic resistance genes (ARGs) to pathogenic bacteria. The rapid spread of multidrug-resistant pathogenic bacteria is a worldwide public health concern. Better understanding the naïve infant gut resistome may build the evidence base for antimicrobial stewardship in both humans and in the food industry. Given the high carriage rate of extended spectrum beta-lactamase (ESBL)- producing Enterobacteriaceae in Asia, we aimed to evaluate community prevalence, dynamics, and longitudinal changes in antibiotic resistance gene (ARG) profiles and prevalence of ESBL-producing .E coli and K. pneumoniae in the intestinal microbiome of infants participating in the Growing Up in Singapore Towards Healthy Outcomes (GUSTO) study, a longitudinal cohort study of pregnant women and their infants. Methods We analysed ARGs in the first year of life among 75 infants who had stool samples collected at multiple timepoints using metagenomics. Results The mean number of ARGs per infant increased with age. The most common ARGs identified confer resistance to aminoglycoside, beta-lactam, macrolide and tetracycline antibiotics; all infants harboured these antibiotic resistance genes at some point in the first year of life. Few ARGs persisted throughout the first year of life. Beta-lactam resistant Escherichia coli and Klebsiella pneumoniae were detected in 4 (5.3%) and 32 (42.7%) of subjects respectively. Conclusion In this longitudinal cohort study of infants living in a region with high endemic antibacterial resistance, we demonstrate that the majority of the infants harboured several antibiotic resistance genes in their gut and showed that the infant gut resistome is diverse and dynamic over the first year of life.

scholarly journals Antibiotic Resistance Genes in Different Animal Manure and their Derived Organic Fertilizer

2020 ◽  
Author(s):  
Yan Xu ◽  
Houyu Li ◽  
Rongguang Shi ◽  
Jiapei Lv ◽  
Bihan Li ◽  
...  
Keyword(s):  
Antibiotic Resistance ◽  
Resistance Genes ◽  
Pathogenic Bacteria ◽  
Bacterial Resistance ◽  
Organic Fertilizer ◽  
Poultry Manure ◽  
Antibiotic Resistance Genes ◽  
Animal Manure ◽  
Procrustes Analysis ◽  
Organic Fertilizers

Abstract Background: The prevalence of antibiotic resistance genes (ARGs) in animal manure poses threats to the environmental safety. Organic fertilizers fermented by livestock and poultry manure are directly applied to farmland, which would cause the potential outbreak of bacterial resistance in agricultural environment. This study investigated the composition of ARGs in different animal manure and their derived organic fertilizers. Results: Results showed that the abundance of several ARGs, such as sul 2, Tet B-01, Tet G-01 and Tet M-01 in organic fertilizer samples was 12%~96% lower than in animal manure. However, there was an increasing of Tet K and erm C abundance from animal manure to the organic fertilizers. No correlation between ARGs and environmental factors such as pH, TN, antibiotics was observed by Redundancy analysis (RDA). Procrustes analysis revealed the significant correlation between bacterial community structures and the ARGs abundance (r=0.799, p<0.01). Non-metric multidimensional scaling (NMDS) analysis suggested that microorganisms in organic fertilizer may be derived from animal manure. Additional, pathogenic bacteria (especially Actinomadura ) would proliferate rather than decrease from manure to organic fertilizer. Conclusion: Overall, this research suggests that the composting treatment of manure could effectively reduce these ARGs and pathogens,even cause partial ARGs and pathogens proliferation. It also shows that the microorganism might significantly influence ARGs profiles in composting.

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