Of the 61 animals diagnosed with colibacillosis on a broiler farm, 40 were treated with the oral administration of enrofloxacin (ERFX) over 3 days, and the remaining 21 were not treated. The number ...of dead and culled broiler chicks in each group was recorded for 9 days before and after the administration of ERFX. The number of dead and culled chicks was converted to the assumption that the number of chicks reared on the day of diagnosis was 10,000, and then the efficacy of ERFX was evaluated. As a result, in the early age group (7 to 28 days old), a decrease in the number of dead and culled chicks was observed from the 2nd day after the start of administration. Also, in the group closer to the late age group (33 to 38 days old), a decrease was observed from the 2nd day after the start of administration, but the dispersion was smaller than for the late age group. However, in the non-treated case group (27 to 38 days old), the number of dead and culled chicks continued to increase after diagnosis, and then showed a tendency to slowly decrease.
Colibacillosis a disease that can cause considerable economic loss, remains an important health problem. Phyllanthus (Phyllanthus niruri L) and turmeric (Curcuma domestica) are herbs that can be used ...as immunomodulators. This study was aimed to determine the level of safety of the combination of phyllanthus and turmeric on hematology profile and liver histopathology of layers with colibacillosis. The layers were assigned to the following of 5 groups: a) colibacillosis group without treatment, b) colibacillosis group with 500 mg/kg BW of phyllanthus, c) colibacillosis group with 300 mg/kg BW of turmeric, d) colibacillosis group with phyllanthus and turmeric combination (1:1), e) colibacillosis group with combination of phyllanthus and turmeric (1:2) . After 21 days of treatment, blood and liver sample were collected. The hematological profile (hemoglobin, hematocrit, erythrocyte and leukocyte counts) and liver histology were examined. The result were analyzed statistically by one-way ANOVA. The group that received phyllanthus had higher levels of hemoglobine, haematocrit and erythrocytes than the control group. However, no significant differences were found for the overall groups. Treatment with the combination of turmeric and phyllanthus for 21 days did not cause changes in the hematological profiles or liver histology, and therefor this herbal combination can be used as an alternative therapy for colibacillosis in layers.
•Chicken colibacillosis, caused by avian pathogenic Escherichia coli (APEC), leads to huge economic losses to the poultry industry.•Gut microbiota depletion exacerbated the lung inflammation and the ...damage to air-blood barrier induced by APEC.•Feeding acetate derived from gut microbiota inhibited the APEC-induced lung injury and the damages to air-blood barrier.•Novel therapeutic targets that focus on the gut microbiota and its metabolites may be effective in the control of colibacillosis.
Chicken colibacillosis is caused by avian pathogenic Escherichia coli (APEC), and results in huge economic losses to the poultry industry. With the investigation of the gut-lung axis, more studies have demonstrated the important role of gut microbiota in lung inflammation. The precise role of the gut microbiota in chickens-associated colibacillosis, however, is unknown. Thus, this study assessed the function of the gut microbiota in the chicken defense against APEC infection. Chicken gut microbiota was depleted by drinking water with a mixture of antibiotics (Abx), and subsequently, a model of colibacillosis was established by the intranasal perfusion of APEC. The results showed that gut microbiota protects the chicken challenge by APEC from aggravated lung histopathologic injury, up-regulated pro-inflammatory cytokine production, and increased bacterial load in lung tissues compared with controls. In addition, the air-blood barrier permeability was significantly increased in gut microbiota-depleted chickens compared to the control chickens after challenge with APEC. Furthermore, feeding acetate significantly inhibited the lung inflammatory response and the reduced air-blood permeability induced by APEC infection. The expression of free fatty acid receptor 2 (FFAR2), a receptor for acetate, was also increased in the lung after treatment with acetate. In conclusion, depletion of the gut microbiota resulted in increased susceptibility of chickens to APEC challenge, and gut microbiota derived acetate acted as a protective mediator during the APEC challenge. Novel therapeutic targets that focus on the gut microbiota may be effective in controlling colibacillosis in poultry.
Avian pathogenic Escherichia coli (APEC) is the causative agent of chicken colibacillosis. Paeoniflorin, a natural ingredient extracted from Paeonia lactiflora, has a variety of pharmacological ...effects including anti-inflammatory and immunomodulatory. However, its effects and mechanism in APEC-induced acute lung injury (ALI) in chicken is not clear. The aim of this study was to investigate the protective effect of paeoniflorin on APEC-induced ALI and its possible mechanism. Paeoniflorin (25, 50, and 100 mg/kg) was administered by gavage for 5 d starting at 9 d of age and the chicken were infected with APEC by intraperitoneal injection at 12 d of age. The tissues were collected after APEC infection for 36 h for analysis. The results showed that paeoniflorin significantly alleviated the symptoms, increased the survival rate and body weight gain of APEC-infected chicken, and improved the histopathological damages, and reduced APEC loads in lung tissues. In addition, paeoniflorin restored the gene expression of ZO-1, Occludin and Claudin-3 during APEC infection. Moreover, paeoniflorin pretreatment significantly affected the endocannabinoid system (ECs) by increasing DAGL, decreasing MAGL, increasing secretion of 2-AG. Then, paeoniflorin significantly decreased the secretion of IL-1β, IL-6 and TNF-α in lung tissues, and decreased the mRNA expression of CXCL8, CXCL12, CCL1, CCL5, and CCL17. In addition, paeoniflorin significantly reduced the phosphorylation levels of PI3K, AKT, P65, and IκB. In summary, we found that paeoniflorin inhibited APEC-induced ALI, and its mechanism may be through affecting ECs and inhibiting the activation of PI3K/AKT and NF-κB signaling pathways, which provides a new idea for the prevention and treatment of chicken colibacillosis.
•Most ETEC isolates belong to phylogroup A, clonotype CH11-24 and CC10.•Prevalent clones O157:HNM-A-ST10 (CH11-24) K88ac and O108:HNM-A-ST10 (CH11-24) F18.•O139:H1-E-ST1 (CH2-54) associated with the ...STEC pathotype.•O141:H4-A-CC10 (CH11-24) and O138:HNM-E-ST42 (CH28-41) associated with ETEC/STEC.•87 % of the isolates were multidrug-resistant, including 9 % of ESBL-producers.
Shiga toxin–producing E. coli (STEC) and enterotoxigenic E. coli (ETEC) are the main agents of swine colibacillosis, an infectious disease which implies important economic losses. We characterized here 186 diarrheagenic E. coli from Spanish industrial pig farms (2005-2017) to know which clones were involved in this syndrome, and the rates of antibiotic resistance. The PCR based on pathotype-associated virulence genes determined that 161 of 186 isolates (86.5 %) exhibited the ETEC pathotype, 10 (5.4 %) the STEC pathotype, and 15 (8.1 %) the hybrid ETEC/STEC pathotype. The majority of the isolates showed phylogroup A (85.5 %), clonotype CH11-24 (72 %) and belonged to the clonal complex (CC) 10, including two ETEC clones accounting for around 50 % of the 186 isolates: O157:HNM-A-ST10 (CH11-24), which exhibited mostly the fimbrial antigen F4ac; and O108:HNM-A-ST10 (CH11-24), which exhibited mainly F18. Other associations were O139:H1-E-ST1 (CH2-54) with the STEC pathotype, and both O141:H4-A-CC10 (CH11-24) and O138:HNM-E-ST42 (CH28-41) with ETEC/STEC. We found that 87.1 % of the isolates were multidrug-resistant, including 9% ESBL-producers, with the highest rates to nalidixic acid (82 %), colistin (77 %), ticarcillin (76 %) and ampicillin (76 %). Besides, more than 50 % of isolates showed non-susceptibility to gentamicin, tobramycin, doxycycline, ciprofloxacin, trimethoprim-sufamethoxazole and chloramphenicol. Additionally, 11 out of 17 ESBL-producing isolates were mcr-carriers. Results suggest that O108:HNM-A-ST10 (CH11-24) F18 is an emerging clone taking space left by other classical serogroups. Further follow-up studies on predominant clones in pig colibacillosis are essential for the update of vaccines, as alternative to the use of antibiotics.
Avian colibacillosis – current aspects Gerasimova, A. O.; Novikova, O. B.; Savicheva, A. A.
Veterinarii︠a︡ segodni︠a︡ = Veterinary science today,
12/2023, Volume:
12, Issue:
4
Journal Article
Peer reviewed
Open access
Colibacillosis is a bacterial disease of humans, animals and birds caused by
Escherichia coli
, pathogenic gram-negative bacillus. Despite its secondary nature, colibacillosis widely affects poultry ...farms and causes significant economic losses. The disease spread is closely associated with antibiotic resistance problem because a diseased carrier bird may be a reservoir of antibiotic-resistant
Escherichia coli
strains. In addition, genes of virulence and resistance have been proven to be transferred from avian
Escherichia
strains toextra intestinal pathogenic strains that are dangerous to humans. Colibacillosis is transmitted aerogenically, alimentally, rarely transovarially, with droppings, mucus, feed, water, handling tools and operating personnel. Birds are most susceptible attheage of1–14days and at the onset of laying period. The disease may present asacute, subacute and chronic forms and is most often manifested by catarrhal hemorrhagic enteritis with profuse foamy diarrhea, respiratory tract lesions, fibrinous peritonitis and polyserositis, as well as a significant decrease in weight gains, stunting, egg laying decrease or complete cessation. Colibacillosis is diagnosed comprehensively taking into account the epizootic situation, findings of clinical examination and postmortem examination of dead or emergency-slaughtered poultry as well as laboratory test and bioassay results. Bacteriological, serological and molecular genetic methods are used for the disease diagnosis. Colibacillosis prevention includes improvement of poultry keeping practice (control of feed and water quality, disinfection, pest control, microclimate control) as well as timely complex vaccination of all poultry. The disease shall be treated taking into account primary etiological factors and bacteria sensitivity to antimicrobials.
Colibacillosis is one of the most important infectious diseases in modern poultry production. The complex nature of colibacillosis has made it challenging to produce an effective vaccine. As a ...control measure for colibacillosis outbreak in Finland, a vaccination program with a commercial colibacillosis vaccine and later also an autogenous vaccine was started for parent flocks in 2017. In this retrospective observational study from years 2016–2019, we evaluated first week and total mortality of broiler flocks (n= 6969) originating from parents with different colibacillosis vaccination status. Broiler flocks were divided into three groups according to vaccination status of their parent flocks. First group were flocks from parents with no colibacillosis vaccines; second group was flocks from parents vaccinated with commercial vaccine only; and third group was flocks from parents with both commercial and autogenous vaccine. Bayesian modelling was used to predict posterior distributions of first week mortality and total mortality of the broiler flocks. Results of the modelling revealed that broiler flocks from unvaccinated parents had the highest mortality rates (mean first week mortality 1.40 % and mean total mortality 4.33 %, respectively) whereas flocks from parents with a combination of commercial and autogenous vaccinations had the lowest mortality rates (mean first week mortality 0,91 % and mean total mortality 3,14 %). The mortalities from broilers flocks from parents with only commercial vaccine fell in between these groups. Also, standard deviations of mortality rates were lower in broilers from parents with commercial or both vaccines. This demonstrates that in addition to lowering the mean mortality rates, the vaccinations made high mortality broiler flocks less common. Best performance was obtained when autogenous vaccine was combined to the commercial vaccine. The autogenous vaccine consists of the same type of Escherichia coli strain that was causing most colibacillosis cases during the study period in Finland. This study adds to the evidence of benefits of colibacillosis vaccines during outbreaks. It also demonstrates the importance of the knowledge of the types of APEC strains causing outbreaks to produce effective autogenous vaccines.
•Colibacillosis vaccination of parent flocks reduced colibacillosis related mortality in broilers.•Bayesian modelling was used to predict posterior distributions of first week and total mortalities of broiler flocks.•Combination of autogenous and commercial vaccine in parents yielded to lowest mortality rates in broilers.
Molecular characterization of avian pathogenic Escherichia coli (APEC) is challenging due to the complex nature of its associated disease, colibacillosis, in poultry. Numerous efforts have been made ...toward defining APEC, and it is becoming clear that certain clonal backgrounds are predictive of an avian E. coli isolate's virulence potential. Thus, APEC can be further differentiated as high-risk APEC based upon their clonal background's virulence potential. However, less clear is the degree of overlap between clinical isolates of differing bird type, and between clinical and gastrointestinal isolates. This study aimed to determine genomic similarities and differences between such populations, comparing commercial broiler vs. turkey isolates, and clinical vs. gastrointestinal isolates. Differences were observed in Clermont phylogenetic groups between isolate populations, with B2 as the dominant group in turkey clinical isolates and G as the dominant group in broiler clinical isolates. Nearly all clinical isolates were classified as APEC using a traditional gene-based typing scheme, whereas 53.4% and 44.1% of broiler and turkey gastrointestinal isolates were classified as APEC, respectively. High-risk APEC were identified among 31.0% and 46.9% of broiler and turkey clinical isolates, compared with 5.7% and 2.9% of broiler and turkey gastrointestinal isolates. As found in previous studies, no specific known virulence or fitness gene sets were identified which universally differentiate between clinical and gastrointestinal isolates. This study further demonstrates the utility of a hybrid APEC typing approach, considering both plasmid content and clonal background, for the identification of dominant and highly virulent APEC clones in poultry production.
Avian pathogenic E. coli (APEC), produces an extraintestinal infection in chickens, turkeys, and other types of birds, called colibacillosis, which is considered one of the main causes of economic ...losses due to morbidity, mortality, and discard of poultry carcasses. The objective of the present study was to characterize the genetic profile of the virulence factors of different isolates of avian E. coli in Caloto, Cauca, Colombia. Materials and methods: E. coli was isolated and identified by biochemical tests, from 47 clinical isolates. Subsequently, the DNA was extracted using Chelex. Three multiplex PCRs were designed to amplify 13 virulence factors (iroN, hlyF, iss, iutA, frz, vat, sitA, KpsM, sitD, fimH, pstB, sopB, and uvrY), using primers previously reported for each. At the end, the amplification products were verified on agarose gels. Each isolate was classified according to the number of virulence factors: group A (between 10 and 13), group B (between 5 and 9), and group C (4 or less). Discussion and Conclusions: we were able to identify the presence of a group of virulence factors in clinical isolates of APEC, which allows us to demonstrate that both the frequency and the profile of virulence factors in the isolated strains showed a different profile than the reported by other authors. The virulence genes pstB and fimH were detected in all our samples, and the iss gene was the one with the lowest frequency. Finally, according to the number of virulence factors, the group A was the most frequent.
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