Peer-reviewed veterinary case report
Ehrlichia canis infection in dogs does not cause immune system
By Hess, Paul R et al.·Published in Veterinary immunology and immunopathology·2006·Department of Clinical Sciences, United States·View original on PubMed →
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Original publication title: Experimental Ehrlichia canis infection in the dog does not cause immunosuppression.
- Species:
- dog
Plain-English summary
A group of eight young dogs was intentionally infected with Ehrlichia canis, a type of bacteria that can cause fever and low platelet counts. While the dogs showed a temporary fever and changes in some immune cells, their overall immune function remained normal, and they were able to produce antibodies against the infection. Interestingly, even though the dogs developed an immune response, they were still susceptible to getting infected again. The study found that their immune systems were not significantly weakened during the first few months after infection, suggesting that they could still fight off other infections effectively.
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Abstract
A carrier state develops in some Ehrlichia canis-infected dogs due to ineffective host defenses. The subsequent development of immune-mediated diseases or opportunistic infections in chronic ehrlichiosis suggests dysregulation of immunity; however, the immunobiology of this infection has not been well characterized. In this study, eight dogs were infected with E. canis, and changes in seroreactivity, serum immunoglobulin (Ig) concentrations, peripheral blood T cell subsets, lymphocyte blastogenesis (LBT), and lymphokine-activated killer (LAK) activity were evaluated over 4 months. Infection, which was documented by seroconversion, polymerase chain reaction, and blood culture, caused self-limiting fever and thrombocytopenia. Infected dogs developed an anti-E. canis antibody response but were not immune to re-infection. Serum IgM, IgG, and IgA concentrations were unaffected by E. canis. The percentage of circulating CD4(+) T cells was similar in uninfected and infected dogs at all points. Infected dogs developed a CD8(+) lymphocytosis 6 weeks after inoculation that subsequently subsided, despite organism persistence. Functional defects of cell-mediated immunity, measured as suppression of LAK activity or mitogen-driven LBT, were not observed. These results suggest that immune responses are not grossly impaired in young dogs during the first several months following experimental E. canis infection.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/16169601/