Evaluation of commercially available Escherichia coli J5 bacterin as protection against experimental challenge with Pasteurella multocida in rabbits

Randall P. Ruble, James S Cullor, Dale L. Brooks

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Abstract

Objective - To evaluate the ability of commercially available Escherichia coli J5 bacterin to protect rabbits from experimental challenge with Pasteurella multocida. Animals - 40 P multocida-free New Zealand White rabbits. Procedures - Rabbits were assigned to 1 of 4 groups of 10 rabbits each. Three of the groups were inoculated SC with J5 bacterin at 8 weeks old. Inoculation was repeated 3 and 6 weeks later. The fourth group was not inoculated and served as controls. Groups 1, 2, and 3 were given 109, 108, and 107 colony forming units (CFU), respectively. Response was monitored by titer assessment, using an E coli J5 antigen capture ELISA. Five weeks after the last inoculation, all rabbits were challenged with P multocida and observed for an additional 5 weeks. Clinical, hematologic, serologic, culture, and necropsy data were collected. Results - Inoculation of rabbits with 109 CFU of E coli J5 bacterin-induced titers that were significantly greater than titers of rabbits vaccinated with 108 or 107 CFU or those in controls. The incidence of acute bacteremia was lower in rabbits with high titers. At necropsy, prevalence of lesions typical of P multocida was not significantly different among groups. Prevalence of histologic lesions was also not significantly different among groups. Conclusions and Clinical Relevance - Although the bacterin induced considerable antibody response and possibly reduced the rate of bacteremia, antibodies were not protective against long-term colonization or infection of the frontal sinuses or tympanic bullae by the challenge strain of P multocida. This bacterin in its currently available form is unlikely to aid in reducing the prevalence of pasteurellosis in rabbits.

Original languageEnglish (US)
Pages (from-to)853-859
Number of pages7
JournalAmerican Journal of Veterinary Research
Volume60
Issue number7
StatePublished - Jul 1999

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Bacterial Vaccines
Pasteurella multocida
rabbits
Escherichia coli
Rabbits
bacteremia
Stem Cells
lesions (animal)
Bacteremia
necropsy
pasteurellosis
Pasteurella Infections
antibodies
New Zealand White rabbit
Frontal Sinus
sinuses
Blister
Antibody Formation
enzyme-linked immunosorbent assay
antigens

ASJC Scopus subject areas

  • veterinary(all)

Cite this

@article{2832950bc64846018fa867fcd34930f1,
title = "Evaluation of commercially available Escherichia coli J5 bacterin as protection against experimental challenge with Pasteurella multocida in rabbits",
abstract = "Objective - To evaluate the ability of commercially available Escherichia coli J5 bacterin to protect rabbits from experimental challenge with Pasteurella multocida. Animals - 40 P multocida-free New Zealand White rabbits. Procedures - Rabbits were assigned to 1 of 4 groups of 10 rabbits each. Three of the groups were inoculated SC with J5 bacterin at 8 weeks old. Inoculation was repeated 3 and 6 weeks later. The fourth group was not inoculated and served as controls. Groups 1, 2, and 3 were given 109, 108, and 107 colony forming units (CFU), respectively. Response was monitored by titer assessment, using an E coli J5 antigen capture ELISA. Five weeks after the last inoculation, all rabbits were challenged with P multocida and observed for an additional 5 weeks. Clinical, hematologic, serologic, culture, and necropsy data were collected. Results - Inoculation of rabbits with 109 CFU of E coli J5 bacterin-induced titers that were significantly greater than titers of rabbits vaccinated with 108 or 107 CFU or those in controls. The incidence of acute bacteremia was lower in rabbits with high titers. At necropsy, prevalence of lesions typical of P multocida was not significantly different among groups. Prevalence of histologic lesions was also not significantly different among groups. Conclusions and Clinical Relevance - Although the bacterin induced considerable antibody response and possibly reduced the rate of bacteremia, antibodies were not protective against long-term colonization or infection of the frontal sinuses or tympanic bullae by the challenge strain of P multocida. This bacterin in its currently available form is unlikely to aid in reducing the prevalence of pasteurellosis in rabbits.",
author = "Ruble, {Randall P.} and Cullor, {James S} and Brooks, {Dale L.}",
year = "1999",
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T1 - Evaluation of commercially available Escherichia coli J5 bacterin as protection against experimental challenge with Pasteurella multocida in rabbits

AU - Ruble, Randall P.

AU - Cullor, James S

AU - Brooks, Dale L.

PY - 1999/7

Y1 - 1999/7

N2 - Objective - To evaluate the ability of commercially available Escherichia coli J5 bacterin to protect rabbits from experimental challenge with Pasteurella multocida. Animals - 40 P multocida-free New Zealand White rabbits. Procedures - Rabbits were assigned to 1 of 4 groups of 10 rabbits each. Three of the groups were inoculated SC with J5 bacterin at 8 weeks old. Inoculation was repeated 3 and 6 weeks later. The fourth group was not inoculated and served as controls. Groups 1, 2, and 3 were given 109, 108, and 107 colony forming units (CFU), respectively. Response was monitored by titer assessment, using an E coli J5 antigen capture ELISA. Five weeks after the last inoculation, all rabbits were challenged with P multocida and observed for an additional 5 weeks. Clinical, hematologic, serologic, culture, and necropsy data were collected. Results - Inoculation of rabbits with 109 CFU of E coli J5 bacterin-induced titers that were significantly greater than titers of rabbits vaccinated with 108 or 107 CFU or those in controls. The incidence of acute bacteremia was lower in rabbits with high titers. At necropsy, prevalence of lesions typical of P multocida was not significantly different among groups. Prevalence of histologic lesions was also not significantly different among groups. Conclusions and Clinical Relevance - Although the bacterin induced considerable antibody response and possibly reduced the rate of bacteremia, antibodies were not protective against long-term colonization or infection of the frontal sinuses or tympanic bullae by the challenge strain of P multocida. This bacterin in its currently available form is unlikely to aid in reducing the prevalence of pasteurellosis in rabbits.

AB - Objective - To evaluate the ability of commercially available Escherichia coli J5 bacterin to protect rabbits from experimental challenge with Pasteurella multocida. Animals - 40 P multocida-free New Zealand White rabbits. Procedures - Rabbits were assigned to 1 of 4 groups of 10 rabbits each. Three of the groups were inoculated SC with J5 bacterin at 8 weeks old. Inoculation was repeated 3 and 6 weeks later. The fourth group was not inoculated and served as controls. Groups 1, 2, and 3 were given 109, 108, and 107 colony forming units (CFU), respectively. Response was monitored by titer assessment, using an E coli J5 antigen capture ELISA. Five weeks after the last inoculation, all rabbits were challenged with P multocida and observed for an additional 5 weeks. Clinical, hematologic, serologic, culture, and necropsy data were collected. Results - Inoculation of rabbits with 109 CFU of E coli J5 bacterin-induced titers that were significantly greater than titers of rabbits vaccinated with 108 or 107 CFU or those in controls. The incidence of acute bacteremia was lower in rabbits with high titers. At necropsy, prevalence of lesions typical of P multocida was not significantly different among groups. Prevalence of histologic lesions was also not significantly different among groups. Conclusions and Clinical Relevance - Although the bacterin induced considerable antibody response and possibly reduced the rate of bacteremia, antibodies were not protective against long-term colonization or infection of the frontal sinuses or tympanic bullae by the challenge strain of P multocida. This bacterin in its currently available form is unlikely to aid in reducing the prevalence of pasteurellosis in rabbits.

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