RESUMO
Aliarcobacter butzleri (formerly known as Arcobacter butzleri) is an emerging food-borne zoonotic pathogen that establishes in vitro endosymbiotic relationships with Acanthamoeba castellanii, a free-living amoeba. Previously, we described that this bacterium acts as an endocytobiont of A. castellanii, surviving for at least 10 days in absence of bacterial replication. Thus, the aim of this study was to evaluate the ability of A. butzleri to survive as a long-term endosymbiont of A. castellanii for 30 days in two models of symbiotic interaction with A. castellanii: (i) endosymbiotic culture followed by gentamicin protection assay and (ii) transwell co-culture assay. The results allow us to conclude that A. butzleri is capable of surviving as an endosymbiont of A. castellanii for at least 30 days, without multiplying, under controlled laboratory conditions. In addition, in the absence of nutrients and as both microorganisms remain in the same culture, separated by semi-permeable membranes, A. castellanii does not promote the survival of A. butzleri, nor does it multiply. Our findings suggest that the greater survival capacity of A. butzleri is associated with their endosymbiont status inside A. castellanii, pointing out the complexity of this type of symbiotic relationship.
Assuntos
Acanthamoeba castellanii , Arcobacter , Acanthamoeba castellanii/microbiologia , SimbioseRESUMO
Arcobacter represents a zoonotic emerging pathogen with increasing importance for public health and drinking water has been cited as a major risk factor for its dissemination. The aim of this work was to evaluate the survival capacity of Arcobacter in different water matrixes stored at different temperatures. Three different water matrixes were used, including potable water with a chlorine concentration of 0,5 mg/mL, non-chlorinated water and non-chlorinated water added with an 11% of organic matter. Each matrix was inoculated in a 1/10 proportion with 103 and 105 Arcobacter pools, divided into 4 different subsamples, in order to be incubated at 0°C, 5°C, 12 °C and 25°C by up to 15 days. The presence of Arcobacter in each matrix was determined on days 1, 3, 5, 7, 9, 11, 13 and 15. Results obtained show that this bacterium can survive in all the water matrixes evaluated, regardless of the presence or not of residual disinfecting agent. Also, the amount of CFU/mL inoculated in water correlates with the number of bacteria that can survive on it, and that incubation temperature has a significant effect over the bacterial survival.
Assuntos
Sobrevida , Água Potável , ArcobacterRESUMO
Conspicuous egg-shaped, white, and smooth structures were observed at a hydrothermal vent site in the Guaymas Basin, Gulf of California. The gelatinous structures decomposed within hours after sampling. Scanning electron microscopy (SEM) and light microscopy showed that the structure consisted of filaments of less than 0.1 µm thickness, similar to those observed for "Candidatus Arcobacter sulfidicus." SEM-energy-dispersive X-ray spectroscopy (EDS) showed that the filaments were sulfur rich. According to 16S rRNA gene amplicon and fluorescence in situ hybridization (FISH) analyses, Arcobacter, a sulfide oxidizer that is known to produce filamentous elemental sulfur, was among the dominant species in the structure and was likely responsible for its formation. Arcobacter normally produces woolly snowflake like structures in opposed gradients of sulfide and oxygen. In the laboratory, we observed sulfide consumption in the anoxic zone of the structure, suggesting an anaerobic conversion. The sulfide oxidation and decomposition of the structure in the laboratory may be explained by dissolution of the sulfur filaments by reaction with sulfide under formation of polysulfides. IMPORTANCE At the deep-sea Guaymas Basin hydrothermal vent system, sulfide-rich hydrothermal fluids mix with oxygenated seawater, thereby providing a habitat for microbial sulfur oxidation. Microbial sulfur oxidation in the deep sea involves a variety of organisms and processes and can result in the excretion of elemental sulfur. Here, we report on conspicuous white and smooth gelatinous structures found on hot vents. These strange egg-shaped structures were often observed on previous occasions in the Guaymas Basin, but their composition and formation process were unknown. Our data suggest that the notable and highly ephemeral structure was likely formed by the well-known sulfide-oxidizing Arcobacter. While normally Arcobacter produces loose flocs or woolly layers, here smooth gel-like structures were found.
Assuntos
Arcobacter/classificação , Arcobacter/metabolismo , Fontes Hidrotermais/microbiologia , Sulfetos/metabolismo , Enxofre/metabolismo , Anaerobiose/fisiologia , Arcobacter/genética , Hibridização in Situ Fluorescente , México , Oceanos e Mares , Oxirredução , RNA Ribossômico 16S/genética , Água do Mar/químicaRESUMO
The first case of acute watery diarrhea disease due to Aliarcobacter butzleri (formerly Arcobacter butzleri) in Ecuador is reported. An infant presented with moderate protein-calorie malnutrition, dehydration and anemia. A curved Gram-negative organism was isolated from stools, having been preliminarily identified by phenotypic characteristics. Definitive identification was achieved by multiplex PCR. Aliarcobacter butzleri was the only pathogenic microorganism isolated. No other entero-pathogens, enterovirus or parasites were found. Our findings strongly suggest that in this specific case, A. butzleri was the etiological agent. Further investigations are needed to develop standardized diagnostic protocols and to establish the prevalence and significance of Aliarcobacter infections in humans.
Assuntos
Arcobacter , Infecções por Bactérias Gram-Negativas , Diarreia/diagnóstico , Equador/epidemiologia , Fezes , Infecções por Bactérias Gram-Negativas/diagnóstico , Humanos , LactenteRESUMO
Andros Island, The Bahamas, composed of porous carbonate rock, has about 175 inland blue holes and over 50 known submerged ocean caves along its eastern barrier reef. These ocean blue holes can have both vertical and horizontal zones that penetrate under the island. Tidal forces drive water flow in and out of these caves. King Kong Cavern has a vertical collapse zone and a deep penetration under Andros Island that emits sulfidic, anoxic water and masses of thin, mucoid filaments ranging to meters in length and off-white turbid water during ebb flow. Our objective was to determine the microbial composition of this mucoid material and the unconsolidated water column turbidity based on the concept that they represent unique lithoautotrophic microbial material swept from the cave into the surrounding ocean. Bacterial DNA extracted from these filaments and surrounding turbid water was characterized using PCR that targeted a portion of the 16S rRNA gene. The genus Arcobacter dominated both the filaments and the water column above the cave entrance. Arcobacter nitrofigilis and Arcobacter sp. UDC415 in the mucoid filaments accounted for as much as 80% of mapped DNA reads. In the water column Arcobacter comprised from 65% to over 85% of the reads in the depth region from about 18 m to 34 m. Bacterial species diversity was much higher in surface water and in water deeper than 36 m than in the intermediate zone. Community composition indicates that ebb flow from the cavern influences the entire water column at least to within 6 m of the surface and perhaps the near surface as well.
Assuntos
Arcobacter/isolamento & purificação , Microbiota/genética , Filogenia , Água do Mar/microbiologia , Arcobacter/genética , Bactérias/classificação , Bactérias/genética , Bactérias/isolamento & purificação , Bahamas , Cavernas/microbiologia , Oceanos e Mares , RNA Ribossômico 16S/genética , Microbiologia da ÁguaRESUMO
The Rimac river is the main source of water for Lima, Peru's capital megacity. The river is constantly affected by different types of contamination including mine tailings in the Andes and urban sewage in the metropolitan area. In this work, we aim to produce the first characterization of aquatic bacterial communities in the Rimac river using a 16S rRNA metabarcoding approach which would be useful to identify bacterial diversity and potential understudied pathogens. We report a lower diversity in bacterial communities from the Lower Rimac (Metropolitan zone) in comparison to other sub-basins. Samples were generally grouped according to their geographical location. Bacterial classes Alphaproteobacteria, Bacteroidia, Campylobacteria, Fusobacteriia, and Gammaproteobacteria were the most frequent along the river. Arcobacter cryaerophilus (Campylobacteria) was the most frequent species in the Lower Rimac while Flavobacterium succinicans (Bacteroidia) and Hypnocyclicus (Fusobacteriia) were the most predominant in the Upper Rimac. Predicted metabolic functions in the microbiota include bacterial motility and quorum sensing. Additional metabolomic analyses showed the presence of some insecticides and herbicides in the Parac-Upper Rimac and Santa Eulalia-Parac sub-basins. The dominance in the Metropolitan area of Arcobacter cryaerophilus, an emergent pathogen associated with fecal contamination and antibiotic multiresistance, that is not usually reported in traditional microbiological quality assessments, highlights the necessity to apply next-generation sequencing tools to improve pathogen surveillance. We believe that our study will encourage the integration of omics sciences in Peru and its application on current environmental and public health issues.
Assuntos
Organismos Aquáticos/genética , Arcobacter/genética , Código de Barras de DNA Taxonômico/métodos , Flavobacterium/genética , Fusobactérias/genética , Microbiota/genética , RNA Ribossômico 16S/genética , Rios/microbiologia , Biologia Computacional/métodos , Monitoramento Ambiental/métodos , Peru , Esgotos/microbiologia , Água/análise , Microbiologia da Água , Poluição da Água/análiseRESUMO
This research aims to investigate the presence and pathogenic potential of Arcobacter in poultry meat samples purchased in the retail market of Valdivia (South of Chile) as well as in faecal samples from backyard chickens from rural areas around this city. The isolates obtained were identified by molecular methods. Furthermore, putative virulence genes were assessed by PCR and the antimicrobial resistance was tested by phenotypic methods. Arcobacter was present in 41·6% of the samples, with the highest value in retail poultry meat (55·7%) followed by backyard production (28·0%). Arcobacter butzleri was the most prevalent species (75·6%) followed by Arcobacter skirrowii (14·8%) and Arcobacter cryaerophilus (9·6%). An 8·5% of A. butzleri strains from meat were resistant to both ciprofloxacin and tetracycline and 6·1% were resistant to erythromycin, while none was resistant to gentamycin, unlike strains from domestic chickens, which showed no resistance. Furthermore, A. butzleri strains from chicken meat presented a higher prevalence of virulence genes than strains from domestic chickens. In fact, in this last group, some genes (hecA, hecB and irgA) were completely absent. Therefore, this study provides insight on the epidemiology of Arcobacter in Chilean poultry and suggests that under traditional breeding conditions strains are, apparently, less pathogenic and drug resistant.
Assuntos
Antibacterianos/farmacologia , Arcobacter/efeitos dos fármacos , Galinhas/microbiologia , Farmacorresistência Bacteriana/genética , Infecções por Bactérias Gram-Negativas/veterinária , Animais , Arcobacter/isolamento & purificação , Chile/epidemiologia , Ciprofloxacina/farmacologia , Eritromicina/farmacologia , Fezes/microbiologia , Microbiologia de Alimentos , Gentamicinas/farmacologia , Infecções por Bactérias Gram-Negativas/epidemiologia , Carne/microbiologia , Reação em Cadeia da Polimerase , Aves Domésticas/microbiologia , Prevalência , Tetraciclina/farmacologia , Virulência , Fatores de Virulência/genéticaRESUMO
É apresentada uma revisão de literatura sobre o gênero Arcobacter, tratando da sua ocorrência determinando doença em humanos, da sua presença no meio ambiente e em alimentos de origem animal contaminados, bem como dos seus prováveis fatores de patogenicidade. Estes microrganismos estão dispersos no meio ambiente, sendo comumente encontrados em animais de produção e produtos de origem animal. Já foram descritos surtos decorrentes da infecção humana a partir do consumo de carne de frango, suína e leite contaminados. Este agente, além de possuir fatores de adesão e invasão para colonizar o trato gastrintestinal, produz citotoxinas que induzem o organismo do hospedeiro à resposta inflamatória.
This is a review on the Arcobacter genus, highlighting its occurrence causing disease in humans, and also its presence in the environment and in contaminated animal foods, as well what is known about its probable pathogenicity factors. These microorganisms are dispersed in the environment, being commonly found in farm animals and animal products. Outbreaks of human infection from the consumption of contaminated chicken, pork and milk have been described. This agent, presents adhesion and invasion factors for gastrointestinal tract colonization and produces cytotoxins that induces the inflammation of the hosts organism.
Assuntos
Arcobacter/classificação , Arcobacter/patogenicidade , Arcobacter/química , Gastroenterite/diagnóstico , Trato GastrointestinalRESUMO
É apresentada uma revisão de literatura sobre o gênero Arcobacter, tratando da sua ocorrência determinando doença em humanos, da sua presença no meio ambiente e em alimentos de origem animal contaminados, bem como dos seus prováveis fatores de patogenicidade. Estes microrganismos estão dispersos no meio ambiente, sendo comumente encontrados em animais de produção e produtos de origem animal. Já foram descritos surtos decorrentes da infecção humana a partir do consumo de carne de frango, suína e leite contaminados. Este agente, além de possuir fatores de adesão e invasão para colonizar o trato gastrintestinal, produz citotoxinas que induzem o organismo do hospedeiro à resposta inflamatória.(AU)
This is a review on the Arcobacter genus, highlighting its occurrence causing disease in humans, and also its presence in the environment and in contaminated animal foods, as well what is known about its probable pathogenicity factors. These microorganisms are dispersed in the environment, being commonly found in farm animals and animal products. Outbreaks of human infection from the consumption of contaminated chicken, pork and milk have been described. This agent, presents adhesion and invasion factors for gastrointestinal tract colonization and produces cytotoxins that induces the inflammation of the hosts organism.(AU)
Assuntos
Arcobacter/química , Arcobacter/classificação , Arcobacter/patogenicidade , Gastroenterite/diagnóstico , Trato GastrointestinalRESUMO
Para la búsqueda de especies de Arcobacter fueron estudiadas 50 muestras de leche bovina obtenidas de los centros de acopio de la empresa láctea Ecolac, de las provincias de Loja y Zamora Chinchipe, Ecuador, y se aisló un total de ocho cepas de Arcobacter butzleri (16%). Esta frecuencia de aislamiento concuerda y está dentro de los rangos descriptos en la literatura. Todas las cepas aisladas fueron sensibles a gentamicina. Se encontró alta frecuencia de resistencia a tetraciclina (6/8 cepas) y a ciprofloxacina (4/8 cepas). Se verificó la ocurrencia de multirresistencia en tres de las ocho cepas aisladas.
A total of 50 samples of bovine milk obtained from bulk tanks milk of the collection centers belonging to the company ECOLAC, of the provinces of Loja and Zamora Chinchipe, Ecuador, were studied for Arcobacter species diagnosis, being isolated 8 strains of Arcobacter butzleri (16%). This frequency of isolation agrees and falls within the ranges described in the literature. All the isolated strains were susceptible to gentamicin. High resistance levels to tetracycline and ciprofloxacin were found with 6/8 and 4/8 resistant strains respectively. Multi-resistance was found in three of the eight isolated strains.
Foram estudadas, para a pesquisa de espécies de Arcobacter, 50 amostras de leite bovino, obtidas dos centros de coleta da empresa de laticínios ECOLAC, das províncias de Loja e Zamora Chinchipe, Equador, sendo isoladas em total 8 cepas de Arcobacter butzleri (16%). Esta frequência de isolamento concorda e está dentro dos níveis descritos na literatura. Todas as cepas isoladas foram sensíveis à gentamicina. Foi encontrada alta frequência de resistência à tetraciclina (6/8 cepas) e à ciprofloxacina (4/8 cepas), sendo verificada a ocorrência de multirresistência em três das oito cepas isoladas.