scholarly journals Evaluating the contingency treatment performance of advanced electro-catalysis oxidation processes for marine bacteria in ballast water

2021 ◽  
Author(s):  
Yulin Xu ◽  
Qiong Wang ◽  
Huixian Wu
Keyword(s):  
Bacterial Diversity ◽  
Marine Bacteria ◽  
Ballast Water ◽  
Pathogenic Bacteria ◽  
Viable Count ◽  
Rrna Gene ◽  
E Coli ◽  
Oxidation Processes ◽  
Treatment Performance ◽  
Electro Catalysis

Abstract Effects of ballast water (BW) treatment by Advanced Electro-Catalysis Oxidation Processes (AEOP) on abundance, activity, and diversity of marine bacteria were examined in a full-scale ballast water management system (BWMS) at Yangshan Port, Shanghai, China. Water samples were collected immediately after treatment and at discharge to evaluate the contingency treatment performance of the BWMS for bacteria. After treatment, the total viable count reduced to 0.7 × 104 CFU·mL−1, and both E. coli and enterococci decreased to 10 CFU·100 mL−1, satisfied the D-2 Standard of the International Maritime Organization (IMO). AEOP can be as an effective contingency reception facility. Sequencing of 16S rRNA gene amplicons demonstrated the declining trend in bacterial diversity, while the treatment did not completely eliminate the risk of bacterial dispersal, including potentially pathogenic bacteria, survived in treated and discharged samples. Bacterial diversity is of greater concern when evaluating effects of ballast water treatment on microorganisms, because the bacteria which can develop adaptive mechanisms to environmental change will have a greater potential for invasion in the new environment.

scholarly journals Endophytic Bacteria from Faloak Plant Seed (Sterculia comosa Wallich) as Antibacterial Agent

2018 ◽  
Vol 10 (3) ◽  
pp. 546-552
Author(s):  
Maria Yasinta Moi ◽  
Endang Kusdiyantini ◽  
Sri Pujiyanto
Keyword(s):  
Antibacterial Agent ◽  
Endophytic Bacteria ◽  
Pathogenic Bacteria ◽  
Inhibition Zone ◽  
Biochemical Properties ◽  
Rrna Gene ◽  
Plant Seed ◽  
E Coli ◽  
Antibiotic Compounds ◽  
Screening Result

Endophytic bacteria isolated from some various kind of plants are able to yield some active compounds which have a role as an antibacterial compound. This work aimed to isolate and to screen the Endophytic bacteria from Faloak seed in its charge in inhibiting two kinds of pathogenic bacteria, Staphylococcus aureus and Escherichia coli. There were six isolates of Endophytic bacteria isolated in this work. According to the screening result, one isolate which had the most potential antibacterial activity (marked by the formation of inhibition zone) against S. aureus and E. coli. That most potential isolate was then tested and identified for both biochemical properties and molecular 16S rRNA gene. The result of this study showed that the endophytic bacteria isolate of Faloak seed with the code of S1 had the similarity with Enterobacter xiangfangensis strain 10-17 by 93 %. The research about endophytic bacteria of Faloak plants was never conducted before. Thus this research was expected to give information about the potential of antimicrobial ability Faloak plants which can be utilized in the discovery of new antibiotic compounds which in the future are expected to overcome the problem of microorganism resistance to antibiotics. The use of endophytic bacteria is expected to prevents the extinction of Faloak plants due to excessive use.

scholarly journals Antibiotic resistance and ESBL production in Escherichia coli from various sources in Aba metropolis, Nigeria

2021 ◽  
Vol 45 (1) ◽  
Author(s):  
Martha Uzoaru Ajuga ◽  
Kome Otokunefor ◽  
Obakpororo Ejiro Agbagwa
Keyword(s):  
Escherichia Coli ◽  
Antibiotic Resistance ◽  
Pathogenic Bacteria ◽  
Clinical Isolates ◽  
Rrna Gene ◽  
Beta Lactamase ◽  
Esbl Production ◽  
Extended Spectrum Beta Lactamase ◽  
E Coli ◽  
Phenotypic Methods

Abstract Background The increase in multidrug resistance (MDR) among pathogenic bacteria responsible for infectious diseases has led to lack of effectiveness of some antibiotics. The ability of Escherichia coli to harbor resistant genes has made the treatment of infections a major challenge. This study was carried out to assess antibiotic resistance and extended-spectrum beta-lactamase (ESBL) production of E. coli from various sources in Aba metropolis, Nigeria. Results From a total of 350 samples collected from clinical and non-clinical sources, 137 were presumptively identified as E. coli by standard phenotypic methods and 83 were confirmed as E. coli by the detection of E. coli specific 16S rRNA gene fragments. The majority of these isolates (52, 62.7%) were from non-clinical sources. The clinical isolates, however, exhibited a higher level of resistance against 62.5% of tested antibiotics. Both group of isolates exhibited similar levels (58.1% vs 53.9%) of MDR, though. A low rate of ESBL production was observed (1.2%) following phenotypic detection of ESBL-producing abilities using the double-disc synergy test. An assessment of the presence of three beta-lactamase gene genotypes (blaTEM, blaSHV and blaCTX-M) revealed that none of the three predominant ESBL genotypes was identified in this study. Conclusions This study reports high levels of antibiotic resistance in both clinical and non-clinical E. coli isolates. Though higher rates of resistance were observed among the non-clinical isolates, both group of organisms had similar levels of MDR. Strikingly, however, was the low level of ESBL producers detected in this study and the absence of the three main genotypes associated with ESBL production in this study.

scholarly journals Ontogeny, species identity, and environment dominate microbiome dynamics in wild populations of kissing bugs (Triatominae)

Microbiome ◽  
2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Joel J. Brown ◽  
Sonia M. Rodríguez-Ruano ◽  
Anbu Poosakkannu ◽  
Giampiero Batani ◽  
Justin O. Schmidt ◽  
...  
Keyword(s):  
Bacterial Diversity ◽  
Pathogenic Bacteria ◽  
Life Stage ◽  
Blood Feeding ◽  
18S Rrna Gene ◽  
Significant Loss ◽  
Individual Variability ◽  
Rrna Gene ◽  
Species Identity ◽  
Microbiome Composition

Abstract Background Kissing bugs (Triatominae) are blood-feeding insects best known as the vectors of Trypanosoma cruzi, the causative agent of Chagas’ disease. Considering the high epidemiological relevance of these vectors, their biology and bacterial symbiosis remains surprisingly understudied. While previous investigations revealed generally low individual complexity but high among-individual variability of the triatomine microbiomes, any consistent microbiome determinants have not yet been identified across multiple Triatominae species. Methods To obtain a more comprehensive view of triatomine microbiomes, we investigated the host-microbiome relationship of five Triatoma species sampled from white-throated woodrat (Neotoma albigula) nests in multiple locations across the USA. We applied optimised 16S rRNA gene metabarcoding with a novel 18S rRNA gene blocking primer to a set of 170 T. cruzi-negative individuals across all six instars. Results Triatomine gut microbiome composition is strongly influenced by three principal factors: ontogeny, species identity, and the environment. The microbiomes are characterised by significant loss in bacterial diversity throughout ontogenetic development. First instars possess the highest bacterial diversity while adult microbiomes are routinely dominated by a single taxon. Primarily, the bacterial genus Dietzia dominates late-stage nymphs and adults of T. rubida, T. protracta, and T. lecticularia but is not present in the phylogenetically more distant T. gerstaeckeri and T. sanguisuga. Species-specific microbiome composition, particularly pronounced in early instars, is further modulated by locality-specific effects. In addition, pathogenic bacteria of the genus Bartonella, acquired from the vertebrate hosts, are an abundant component of Triatoma microbiomes. Conclusion Our study is the first to demonstrate deterministic patterns in microbiome composition among all life stages and multiple Triatoma species. We hypothesise that triatomine microbiome assemblages are produced by species- and life stage-dependent uptake of environmental bacteria and multiple indirect transmission strategies that promote bacterial transfer between individuals. Altogether, our study highlights the complexity of Triatominae symbiosis with bacteria and warrant further investigation to understand microbiome function in these important vectors.

scholarly journals Hygiene management in newborn individually housed dairy calves focusing on housing and feeding practices

2020 ◽  
Author(s):  
Céline Heinemann ◽  
Caroline D Leubner ◽  
Jason J Hayer ◽  
Julia Steinhoff-Wagner
Keyword(s):  
Pathogenic Bacteria ◽  
Total Coliform ◽  
Viable Count ◽  
Dairy Calves ◽  
Salmonella Spp ◽  
Protein Residues ◽  
E Coli ◽  
Hygiene Management ◽  
Hygiene Measures ◽  
Calf Rearing

Abstract In calf rearing, the first weeks of life are critical and associated with the highest mortality due to enteric and respiratory diseases. A well-implemented hygiene management can help to protect calves´ health preventively by reducing the load of pathogenic bacteria and interrupting infection chains. The aim of this study was to identify deficiencies in hygiene management of individually housed dairy calves by surveying current practice and examining feeding and housing equipment with different hygiene indicators. On 11 farms, different locations in 2 pens or hutches for individual calf rearing prepared for restocking and 2 feeding buckets per farm, including the inner and outer surfaces of artificial teats, were visually scored for cleanliness and sampled with swabs (housing equipment: n = 167; feeding equipment: n = 120). The sanitation of floors was tested with sock samples (n = 41). A total of 328 samples were analyzed for adenosine triphosphate (ATP) and protein residues, aerobic total viable count (TVC), total coliform count (TCC), Escherichia coli, methicillin-resistant Staphylococcus aureus (MRSA), extended spectrum β-lactamase-producing bacteria (ESBL) and Salmonella spp. After evaluation of these results, the farmers were informed about the findings and trained on improvement in hygiene management personally. The sampling was repeated after one year to detect possible changes in hygiene management. The highest bacterial loads (TVC, TCC and E. coli) were observed in feeding equipment, especially the inner teat of milk feeding buckets. Environmental samples, primarily the sidewalls and back walls of tested pens and hutches, exhibited the lowest bacterial counts and ATP and protein residues. All samples were negative for MRSA and Salmonella spp. In 10.5% of all samples, ESBL was detected, and in 6.8%, ESBL E. coli was detected, predominately in sock samples, followed by feeding equipment samples. Training in hygiene management showed only limited effects. In conclusion, there is still great potential to improve the implementation of hygiene measures in individual calf housing. In particular, more attention should be paid to the cleaning of feeding buckets and artificial teats, as this is a simple means of interrupting the possible spread of pathogens among calves.

scholarly journals Microbiome Analysis Reveals the Attenuation Effect of Lactobacillus From Yaks on Diarrhea via Modulation of Gut Microbiota

2021 ◽  
Vol 10 ◽  
Author(s):  
Hailong Dong ◽  
Bingxian Liu ◽  
Aoyun Li ◽  
Mudassar Iqbal ◽  
Khalid Mehmood ◽  
...  
Keyword(s):  
Microbial Community ◽  
Gut Microbiota ◽  
Pathogenic Bacteria ◽  
Growth Promotion ◽  
Amplicon Sequencing ◽  
Treated Group ◽  
Control Group ◽  
Rrna Gene ◽  
The Tibetan Plateau ◽  
E Coli

Domestic yaks (Bos grunniens) are indigenous to the Tibetan Plateau and display a high diarrhea rate due to poor habitat and husbandry conditions. Lactobacillus has been shown to exert beneficial effects as antimicrobial, growth promotion, and gut microbiota in humans and/or murine models, but the relevant data regarding Lactobacillus isolated from yaks was unavailable. Therefore, this study aimed to investigate the effects of Lactobacillus from yaks on the intestinal microbial community in a mouse model and determine whether Lactobacillus supplementation contributed in alleviating diarrhea by modulating gut microbiota. A total of 12 ileac samples from four groups were collected for 16S rRNA gene amplicon sequencing of V3-V4 region. Results revealed that although Lactobacillus supplementation did not change the diversity of gut microbiota in mice, the proportion of some intestinal microbiota significantly changed. Specifically, the proportion of Lactobacillus and Sphingomonas in the Lactobacillus treated-group (L-group) were increased as compared to control group (C-group), whereas Pantoea, Cutibacterium, Glutamicibacter, Turicibacter, Globicatella, Microbacterium, Facklamia, unidentified_Corynebacteriaceae, Brachybacterium, and Staphylococcus were significantly decreased in the L-group. In contrast, Escherichia coli (E. coli) infection significantly decreased the proportion of beneficial bacteria such as Globicatella, Acinetobacter, Aerococcus, and Comamonas, while loads of pathogenic bacteria significantly increased including Roseburia and Megasphaera. Interestingly, Lactobacillus administration could ameliorate the microbial community structure of E. coli-induced diarrheal mice by reducing the relative abundance of pathogenic bacteria such as Paenibacillus, Aerococcus, Comamonas, Acinetobacter, Corynebacterium, Facklamia, and Globicatella. Results in this study revealed that Lactobacillus supplementation not only improved the gut microbiota but also alleviated diarrhea in mice, which may be mediated by modulating the composition and function of gut microbiota. Moreover, this study is expected to provide a new theoretical basis for the establishment of a preventive and treatment system for diarrhea in yaks.

scholarly journals Antibacterial activity of marine bacteria associated with sponges from Phu Quoc island in Vietnam

2016 ◽  
Vol 14 (1) ◽  
pp. 181-190
Author(s):  
Phan Thi Hoai Trinh ◽  
Ngo Thi Duy Ngoc ◽  
Phi Quyet Tien ◽  
Le Dinh Hung ◽  
Vo Thi Dieu Trang ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
16S Rrna ◽  
16S Rrna Gene ◽  
Marine Bacteria ◽  
Rrna Gene ◽  
Potential Candidate ◽  
Bacterial Strains ◽  
E Coli ◽  
Animal Pathogens ◽  
Agar Well Diffusion Assay

Sponge associated marine microbes recognised as potential candidate for screening and isolation of bioactive compounds. In this work, thirty-one marine bacterial strains associated with seven species of sponges collected from Phu Quoc Island, Vietnam were isolated and screened for antimicrobial activity against selected human and animal pathogens including Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Vibrio parahaemolyticus, Vibrio harveyi, Bacillus cereus, Streptococcus faecalis, Listeria monocytogenes, Proteus mirabilis and Klebsiella pneumoniae using agar well diffusion assay. Twenty-six percent of bacterial strains were found to be antibacterial producers and their activities ranged from broad spectral to species specific (P. aeruginosa, E. coli, P. mirabilis, B. cereus, and L. monocytogenes). Out of the 31 marine bacterial strains subjected to preliminary screening for antibacterial activity, 8 isolates exhibited antibacterial activity against at least two tested pathogens, that 55% against P. mirabilis, 22% against P. aeruginosa, 10% against E. coli and 6% against K. pneumoniae, B. cereus and L. monocytogenes. A strain coded 045-203-4 was found to be highly potent and was cultured for further study. The strain produced metabolites with good activity in medium contained yeast extract (0.8% w/v), glucose (0.5%) at pH 7.0 and after incubated shaking for 30 h at 150 rpm. In addition, strain 045-203-4 was analyzed for morphological and physiological characteristics. Analysis of the nucleotide sequence of 16s rRNA gene of strain 045-203-4 showed a strong similarity (99%) with that of the 16s rRNA gene of Bacillus subtilis. The present investigation reveals that the marine bacteria isolated from sponges at Phu Quoc Island can be a definite source for novel antibiotics.

scholarly journals Ontogeny, species identity and environment dominate microbiome dynamics in wild populations of kissing bugs (Triatominae)

2020 ◽  
Author(s):  
Joel J. Brown ◽  
Sonia M. Rodríguez-Ruano ◽  
Anbu Poosakkannu ◽  
Giampiero Batani ◽  
Justin O. Schmidt ◽  
...  
Keyword(s):  
Bacterial Diversity ◽  
Pathogenic Bacteria ◽  
Life Stage ◽  
Blood Feeding ◽  
18S Rrna Gene ◽  
Significant Loss ◽  
Individual Variability ◽  
Rrna Gene ◽  
Species Identity ◽  
Microbiome Composition

AbstractBackgroundKissing bugs (Triatominae) are blood-feeding insects best known as the vectors of Trypanosoma cruzi, the causative agent of Chagas’ disease. Considering the high epidemiological relevance of these vectors, their biology and bacterial symbiosis remains surprisingly understudied. While previous investigations revealed generally low individual complexity but high among-individual variability of the triatomine microbiomes, any consistent microbiome determinants have not yet been identified across multiple Triatominae species.MethodsTo obtain a more comprehensive view of triatomine microbiomes, we investigated the host-microbiome relationship of five Triatoma species sampled from white-throated woodrat (Neotoma albigula) nests in multiple locations across the USA. We applied optimized 16S rRNA gene metabarcoding with a novel 18S rRNA gene blocking primer to a set of 170 T. cruzi negative individuals across all six instars.ResultsTriatomine gut microbiome composition is strongly influenced by three principal factors: ontogeny, species identity, and the environment. The microbiomes are characterised by significant loss in bacterial diversity throughout ontogenetic development. First instars possess the highest bacterial diversity while adult microbiomes are routinely dominated by a single taxon. Primarily, the bacterial genus Dietzia dominates late-stage nymphs and adults of T. rubida, T. protracta, and T. lecticularia, but is not present in the phylogenetically more distant T. gerstaeckeri and T. sanguisuga. Species-specific microbiome composition, particularly pronounced in early instars, is further modulated by locality-specific effects. In addition, pathogenic bacteria of the genus Bartonella, acquired from the vertebrate hosts, are an abundant component of Triatoma microbiomes.ConclusionOur study is the first to demonstrate deterministic patterns in microbiome composition among all life stages and multiple Triatoma species. We hypothesize that triatomine microbiome assemblages are produced by species- and life stage-dependent uptake of environmental bacteria and multiple indirect transmission strategies that promote bacterial transfer between individuals. Altogether, our study highlights the complexity of Triatominae symbiosis with bacteria and warrant further investigation to understand microbiome function in these important vectors.

scholarly journals Study of antibacterial activity of Streptomyces sp. SS473 isolated from plants against ESBL-producing Escherichia coli

2021 ◽  
Vol 63 (9) ◽  
pp. 26-32
Author(s):  
Trung Hieu Nguyen ◽  
◽  
Phuoc Dat Nguyen ◽  
Thi Ngoc Quyen Nguyen ◽  
Le Truc Ha Tran ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Broad Spectrum ◽  
Bacterial Infections ◽  
Pathogenic Bacteria ◽  
Antibacterial Properties ◽  
Morphological Identification ◽  
Rrna Gene ◽  
Streptomyces Sp ◽  
E Coli ◽  
New Antibiotics

The broad spectrum β-lactamase-producing E. coli(ESBL) is a dangerous bacterial pathogen in humans due to its resistance to many antibiotics. This is especially serious in the context of a limited number of new antibiotics for treating bacterial infections. This leads to a global public health threat and places an urgent need for new antibiotics. In this study, the authors investigated the antibacterial properties of an actinomyces strain isolated from the plant Clinacanthus nutans against the ESBL-producing E. coli strains. These actinomyces strains were designated as SS473. Moreover, SS473 showed a broad spectrum of antibacterial activity on several clinically isolated pathogenic bacteria. Culture media have different effects on the antibacterial activity of SS473. In stability tests, the antibacterial activity of strain SS473 remained at a temperature up to 80oC but was lost at pH 3 and 13. By contrast, the antibacterial activity was not affected by UV and protease treatments. Based on the results of morphological identification with specific media for Streptomyces and molecular identification on 16S rRNA gene, strain SS473 was suggested to belong to the Streptomyces genus and was named Streptomycessp. SS473. The results in this study will pave the way for the following research on the identification of secondary metabolites having antibacterial activity and their biosynthetic pathways in Streptomyces sp. SS473 in the future

scholarly journals Comparative microbiological analysis of raw fishes and sun-dried fishes collected from the Kawran bazaar in Dhaka city, Bangladesh

Food Research ◽  
2020 ◽  
Vol 4 (3) ◽  
pp. 846-851
Author(s):  
I.T. Nur ◽  
B. Ghosh ◽  
M. Acharjee
Keyword(s):  
Pathogenic Bacteria ◽  
Microbiological Quality ◽  
Total Coliform ◽  
Viable Count ◽  
Quality Analysis ◽  
Microbiological Analysis ◽  
Total Viable Count ◽  
Salmonella Spp ◽  
E Coli ◽  
Coliform Count

Along with the raw fishes, dry fishes also have a huge contribution to meet up the demand of protein in our daily meal. The assay of microbiological quality is therefore needed to ensure the public health safety. The present study was emphasized on the existence of pathogenic bacteria in raw and dry fish. A total of 50 samples of raw fishes and sun-dried fishes was accumulated aseptically for microbiological quality analysis. Isolation of bacteria was done by spread plate method. All the samples including both (raw and dry) fishes harbored bacteria and fungi up to 106 CFU/g. E. coli was found in all samples as a specific pathogen. In case of raw fishes total viable count (TVC) and total coliform count (E. coli) were recorded up to 2.5x106 CFU/g and 5.2 x104 CFU/g respectively whereas a significant load of Salmonella spp. was observed in almost all samples. Staphylococcus spp. and Pseudomonas spp. were present up to 5 x102 CFU/g and 1.8 x 102 CFU/g respectively. Likewise, total viable count (TVC), total coliform count (E. coli) and fungal load were recorded in dry fish up 3.50 x 105 CFU/g, 1.2 x103 CFU/g respectively. Fungal growth was observed in all experimental raw and dried fishes. For most of the pathogenic isolates, higher rates of resistance were found against Ceftriaxone, Penicillin, Nalidixic acid, Neomycin. On the other hand, most of the isolates were found to retain higher sensitivity against Imipenem, Ciprofloxacin, Tetracyclin and Amoxicillin. This data suggested that the dry fish harbored fewer bacteria than raw fish and sun drying method is still a useful technique for the preservation of fish.

scholarly journals Bacterial diversity in the gastrointestinal tracts of Rhinolophus luctus and Murina leucogaster in Henan Province, China

2019 ◽  
Vol 69 (13) ◽  
pp. 1407-1414 ◽  
Author(s):  
Yan Sun ◽  
Zhimin Yuan ◽  
Yuming Guo ◽  
Yuanzhao Qin ◽  
Yongtian Ban ◽  
...  
Keyword(s):  
Bacterial Diversity ◽  
High Throughput ◽  
Disease Transmission ◽  
Pathogenic Bacteria ◽  
High Throughput Sequencing ◽  
Rrna Gene ◽  
Human Pathogens ◽  
Sequencing Platform ◽  
Bacterial Phyla ◽  
Gastrointestinal Bacteria

Abstract Purpose Previous studies have assessed the diversity of gastrointestinal bacteria in bats and reported that some of the strains are pathogenic to humans; therefore, bats are considered to be potential reservoirs of zoonotic pathogens. However, the bacterial diversity and types of pathogenic bacteria in the gastrointestinal tracts of Rhinolophus luctus and Murina leucogaster have not yet been determined. Humans frequently come into contact with these species; therefore, assessments of their gut microbiota, especially potential pathogens, are essential for public health. In the present study, MiSeq high-throughput sequencing was used to address this research gap, and the results were compared with those reported previously. Methods The V3–V4 regions of the 16S rRNA gene were sequenced using the MiSeq high-throughput sequencing platform to determine the bacterial community of the stomach and the intestines of R. luctus and M. leucogaster. Results The bacteria in the gastrointestinal tracts of R. luctus and M. leucogaster were classified into three and four main bacterial phyla, respectively. In both R. luctus and M. leucogaster, the dominant phylum was Proteobacteria (stomach 86.07% and 95.79%, intestines 91.87% and 88.78%, respectively), followed by Firmicutes (stomach 13.84% and 4.19%, intestines 8.11% and 11.20%, respectively). In total, 18 and 20 bacterial genera occurred in a relative abundance of 0.01% or more in the gastrointestinal tracts of R. luctus and M. leucogaster, respectively. In R. luctus, the dominant genera were Lactococcus (10.11%) and Paeniclostridium (3.41%) in the stomach, and Undibacterium (28.56%) and Paeniclostridium (4.69%) in the intestines. In M. leucogaster, the dominant genera were Undibacterium (54.41%) and Burkholderia (5.28%) in the stomach, and Undibacterium (29.67%) and Enterococcus (7.19%) in the intestines. Among the detected gastrointestinal tract flora of R. luctus and M. leucogaster, 12 bacterial genera were pathogenic or opportunistic pathogens. Conclusion A high number of human pathogens were detected in the gastrointestinal tracts of R. luctus and M. leucogaster, which demonstrates the urgency for increased efforts in the prevention and management of bat-to-human disease transmission from these species.

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