Immunization but not natural infection of horses results in antibody activity against the S protein of Streptococcus equi subsp equi.

Autor:	Cohen ND; Equine Infectious Disease Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX., Hughes EV; Equine Infectious Disease Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX., Bayne C; Department of Pharmacology, School of Medicine, University of California-San Diego, La Jolla, CA.; Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California-San Diego, La Jolla, CA.; Center for Microbiome Innovation, Jacobs School of Engineering, University of California-San Diego, La Jolla, CA., Morris ERA; Equine Infectious Disease Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX., Bray JM; Equine Infectious Disease Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX., Landrock KK; Equine Infectious Disease Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX., Gonzales DM; Equine Infectious Disease Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX., Baker RM; Equine Infectious Disease Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX., Klein RL; Equine Infectious Disease Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX., Liu W; Center for Infectious and Inflammatory Diseases, Institute of Biosciences and Technology, Texas A&M University, Houston, TX., Legere RM; Equine Infectious Disease Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX., Wehmeyer SG; Equine Infectious Disease Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX., Bordin AI; Equine Infectious Disease Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX., Wierzbicki IH; Department of Pharmacology, School of Medicine, University of California-San Diego, La Jolla, CA.; Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California-San Diego, La Jolla, CA.; Center for Microbiome Innovation, Jacobs School of Engineering, University of California-San Diego, La Jolla, CA., Gonzalez DJ; Department of Pharmacology, School of Medicine, University of California-San Diego, La Jolla, CA.; Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California-San Diego, La Jolla, CA.; Center for Microbiome Innovation, Jacobs School of Engineering, University of California-San Diego, La Jolla, CA.
Jazyk:	angličtina
Zdroj:	American journal of veterinary research [Am J Vet Res] 2024 Dec 16, pp. 1-11. Date of Electronic Publication: 2024 Dec 16.
DOI:	10.2460/ajvr.24.08.0228
Abstrakt:	Objective: Evaluate the immunogenicity of a vaccine targeting the S protein (Ssee) of Streptococcus equi subsp equi and determine antibody activity against Ssee in horses with strangles. Methods: The study was designed as a prospective experiment using 20 university-owned Quarter Horses and a cross-sectional serosurvey of 78 privately owned horses with strangles. Horses were immunized IM with 0 (n = 4), 200 (n = 8), or 400 (n = 8) μg of recombinant Ssee at weeks 0, 4, and 12. Serum and nasal secretions were collected at weeks 0, 4, 6, 12, 16, and 28 and tested by ELISA for immunoglobulin (Ig)-G against Ssee; nasal secretions were also tested for anti-Ssee IgA. The function of anti-Ssee IgG in serum was tested for complement deposition onto Ssee and opsonophagocytic killing of S equi subsp equi. Serum from horses with strangles was tested by ELISA for anti-Ssee IgG activity. Results: Immunization with Ssee significantly (P < .05) increased serum and nasal IgG (but not nasal IgA) against Ssee for up to 12 weeks after the third immunization, and serum from vaccinated horses mediated significantly (P < .001) greater complement deposition onto Ssee, but not opsonophagocytic killing (P > .05), than controls. Horses with strangles did not develop high levels of serum IgG activity against Ssee. Conclusions: Immunizing horses with Ssee resulted in increased activity of functional IgG in serum and nasal secretions, and horses with strangles had very low levels of serum IgG activity against Ssee. Clinical Relevance: S protein has potential as a vaccine to reduce the severity of strangles and differentiate between infected and vaccinated horses.
Databáze:	MEDLINE
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