Subcutaneous inoculation of Escherichia coli in broiler chickens causes cellulitis and elicits innate and specific immune responses
Abstract Background Cellulitis caused by Escherichia coli is a common cause of condemnation of broiler chickens at slaughter worldwide and is associated with economic losses and a possible negative impact on animal welfare. The study objective was to monitor clinical signs and immune responses after...
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| Materiálatiipa: | Artihkal |
| Giella: | English |
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BMC
2024-12-01
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| Ráidu: | BMC Veterinary Research |
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| Liŋkkat: | https://doi.org/10.1186/s12917-024-04392-2 |
| _version_ | 1826945786973257728 |
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| author | Liv Jonare Eva Wattrang Emma Östlund Helena Wall Magdalena Jacobson Désirée S. Jansson |
| author_facet | Liv Jonare Eva Wattrang Emma Östlund Helena Wall Magdalena Jacobson Désirée S. Jansson |
| author_sort | Liv Jonare |
| collection | DOAJ |
| description | Abstract Background Cellulitis caused by Escherichia coli is a common cause of condemnation of broiler chickens at slaughter worldwide and is associated with economic losses and a possible negative impact on animal welfare. The study objective was to monitor clinical signs and immune responses after subcutaneous E. coli inoculation (1.1–1.8 × 107 CFU), aiming to induce cellulitis. Three groups of broiler chickens (n = 15/group) were inoculated with well-characterized E. coli strains (group A: ECA18 O24:H4/ST117 and group B: ECB11 O153:H9/ST38) or with saline (control) at 22 days-of-age. Clinical signs of disease, body weight and immune parameters were monitored until euthanasia 12–14 days after inoculation followed by post-mortem examination. Results The daily weight gain of the inoculated chickens was significantly lower one day after inoculation compared to the controls. Seven (23%) of the inoculated chickens displayed clinical signs: ruffled feathers, mild weakness, open-beak breathing and/or reluctance to stand, of which two birds were euthanized and one bird died. Five chickens in group B were observed with bacteraemia, which lasted up to three days after inoculation for two chickens. A transient increase in chicken mannose receptor MRC1L-B expression on circulating monocytes was observed one day after inoculation in both E. coli inoculated groups, with a more pronounced increase in group B. On day 7 after inoculation, the in vitro adherence of heterophils, monocytes and thrombocytes to the inoculated strain was increased in group B. Antibody titers to the inoculation strains were increased in some chickens in both groups on days 7 and 14 after inoculation, with the highest titers in group B. Seven (47%) and 13 (87%) of the chickens in group A and B, respectively, were diagnosed with cellulitis at post-mortem examination. In most birds, lesions consisted of plaque-like material embedded in the subcutaneous tissue of the abdominal wall. Conclusions Inoculation of E. coli caused cellulitis and prompted a rapid activation/redistribution of circulating monocytes followed by antibody production. The responses were most pronounced in chickens inoculated with E. coli strain ECB11, presumably because of a higher virulence. |
| first_indexed | 2025-02-17T21:01:21Z |
| format | Article |
| id | doaj.art-1c38eb66e6ab4d0b9442a56cb42b51cf |
| institution | Directory Open Access Journal |
| issn | 1746-6148 |
| language | English |
| last_indexed | 2025-02-17T21:01:21Z |
| publishDate | 2024-12-01 |
| publisher | BMC |
| record_format | Article |
| series | BMC Veterinary Research |
| spelling | doaj.art-1c38eb66e6ab4d0b9442a56cb42b51cf2024-12-08T12:33:47ZengBMCBMC Veterinary Research1746-61482024-12-0120111810.1186/s12917-024-04392-2Subcutaneous inoculation of Escherichia coli in broiler chickens causes cellulitis and elicits innate and specific immune responsesLiv Jonare0Eva Wattrang1Emma Östlund2Helena Wall3Magdalena Jacobson4Désirée S. Jansson5Department of Clinical Sciences, Swedish University of Agricultural SciencesDepartment of Microbiology, Swedish Veterinary AgencyDepartment of Microbiology, Swedish Veterinary AgencyDepartment of Applied Animal Science and Welfare, Swedish University of Agricultural SciencesDepartment of Clinical Sciences, Swedish University of Agricultural SciencesDepartment of Clinical Sciences, Swedish University of Agricultural SciencesAbstract Background Cellulitis caused by Escherichia coli is a common cause of condemnation of broiler chickens at slaughter worldwide and is associated with economic losses and a possible negative impact on animal welfare. The study objective was to monitor clinical signs and immune responses after subcutaneous E. coli inoculation (1.1–1.8 × 107 CFU), aiming to induce cellulitis. Three groups of broiler chickens (n = 15/group) were inoculated with well-characterized E. coli strains (group A: ECA18 O24:H4/ST117 and group B: ECB11 O153:H9/ST38) or with saline (control) at 22 days-of-age. Clinical signs of disease, body weight and immune parameters were monitored until euthanasia 12–14 days after inoculation followed by post-mortem examination. Results The daily weight gain of the inoculated chickens was significantly lower one day after inoculation compared to the controls. Seven (23%) of the inoculated chickens displayed clinical signs: ruffled feathers, mild weakness, open-beak breathing and/or reluctance to stand, of which two birds were euthanized and one bird died. Five chickens in group B were observed with bacteraemia, which lasted up to three days after inoculation for two chickens. A transient increase in chicken mannose receptor MRC1L-B expression on circulating monocytes was observed one day after inoculation in both E. coli inoculated groups, with a more pronounced increase in group B. On day 7 after inoculation, the in vitro adherence of heterophils, monocytes and thrombocytes to the inoculated strain was increased in group B. Antibody titers to the inoculation strains were increased in some chickens in both groups on days 7 and 14 after inoculation, with the highest titers in group B. Seven (47%) and 13 (87%) of the chickens in group A and B, respectively, were diagnosed with cellulitis at post-mortem examination. In most birds, lesions consisted of plaque-like material embedded in the subcutaneous tissue of the abdominal wall. Conclusions Inoculation of E. coli caused cellulitis and prompted a rapid activation/redistribution of circulating monocytes followed by antibody production. The responses were most pronounced in chickens inoculated with E. coli strain ECB11, presumably because of a higher virulence.https://doi.org/10.1186/s12917-024-04392-2CellulitisAPECChicken mannose receptor MRC1L-BImmune responsePost-mortem findingsIgY |
| spellingShingle | Liv Jonare Eva Wattrang Emma Östlund Helena Wall Magdalena Jacobson Désirée S. Jansson Subcutaneous inoculation of Escherichia coli in broiler chickens causes cellulitis and elicits innate and specific immune responses BMC Veterinary Research Cellulitis APEC Chicken mannose receptor MRC1L-B Immune response Post-mortem findings IgY |
| title | Subcutaneous inoculation of Escherichia coli in broiler chickens causes cellulitis and elicits innate and specific immune responses |
| title_full | Subcutaneous inoculation of Escherichia coli in broiler chickens causes cellulitis and elicits innate and specific immune responses |
| title_fullStr | Subcutaneous inoculation of Escherichia coli in broiler chickens causes cellulitis and elicits innate and specific immune responses |
| title_full_unstemmed | Subcutaneous inoculation of Escherichia coli in broiler chickens causes cellulitis and elicits innate and specific immune responses |
| title_short | Subcutaneous inoculation of Escherichia coli in broiler chickens causes cellulitis and elicits innate and specific immune responses |
| title_sort | subcutaneous inoculation of escherichia coli in broiler chickens causes cellulitis and elicits innate and specific immune responses |
| topic | Cellulitis APEC Chicken mannose receptor MRC1L-B Immune response Post-mortem findings IgY |
| url | https://doi.org/10.1186/s12917-024-04392-2 |
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