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Prevention of rotavirus diarrhoea in foals by parenteral vaccination of the mares: field trial.

Abstract: Many countries have reported rotavirus diarrhoea in foals. In Argentina it causes important economic losses to the horse industry. In this work we present the results obtained using an experimental vaccine in a farm with enzootic infection of rotavirus. A hundred mares were vaccinated 60 and 30 days before foaling with inactivated rotavirus SA11 (G3P2), H2 (G3P12), Lincoln (G6P1), with aluminum hydroxide as adjuvant; 65 mares were included in the unvaccinated, control group. To evaluate the vaccine, morbidity, duration of the diarrhoea and rotavirus shedding were recorded. Antibody levels were established in serum, colostrum and milk of the vaccinated mares, and also in serum from the foals. In foals from vaccinated mares the morbidity was 30%, clinical signs were observed during 1.8 days, and rotavirus shedding was not detected. In the control group the morbidity reached 80%, the clinical signs lasted 7.3 days and rotavirus shedding was detected in 80% of the diarrhoeic foals. At foaling the serum antibody levels were 15 times higher with a mean neutralizing titre (NT) of 3.5 logs than before vaccination (2.4 logs), in colostrum 5.00 logs, and in milk at 90 days post partum 1.7 logs. In foals from vaccinated mares the level of neutralizing antibodies was 3.8 logs at 48 days of age, going down to 2.2 logs at 90 days of age. Immunization of the pregnant mare would be a good method for preventing diarrhoea in foals.
Publication Date: 1998-05-15 PubMed ID: 9580371
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  • Clinical Trial
  • Journal Article

Summary

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This research focuses on the prevention of rotavirus diarrhea in foals by protecting the mares with a vaccine. The study was carried out in Argentina where the disease has had significant financial consequences for the equine industry.

Vaccine Development and Administration

  • As a part of the study, 100 mares were vaccinated using specifically developed vaccines for rotavirus.
  • The vaccines were developed from three types of inactivated rotavirus – SA11 (G3P2), H2 (G3P12), and Lincoln (G6P1), with aluminum hydroxide used as an additive to increase the immune response.
  • The mares were immunized twice, once 60 days and again 30 days before they were due to give birth.

Control Group

  • For comparison, a control group of 65 unvaccinated mares was also included in the study.

Vaccine Evaluation

  • The effectivity of the vaccine was determined by comparing several factors between the vaccinated mares and the control group.
    • Morbidity or the rate of illness, duration of diarrhea, and the presence of rotavirus in feces were the primary factors observed.
    • The level of antibodies (substances produced by the immune system to fight off diseases) in the mares’ serum, colostrum (first milk), and subsequent milk were also measured. Serum from their offspring was also tested.

Results

  • The results showed a significantly lower morbidity rate among the foals born to vaccinated mares compared to the control group.
  • The duration of clinical symptoms and the presence of rotavirus in feces from the vaccinated group were also significantly less.
  • The vaccinated mares showed a markedly increased level of antibodies in their serum, colostrum, and milk. The foals from these mares also had higher antibody levels.

Conclusion

  • The study concludes that vaccination of pregnant mares can be an effective method for preventing rotavirus diarrhea in their offspring.

Cite This Article

APA
Barrandeguy M, Parreño V, Lagos Mármol M, Pont Lezica F, Rivas C, Valle C, Fernandez F. (1998). Prevention of rotavirus diarrhoea in foals by parenteral vaccination of the mares: field trial. Dev Biol Stand, 92, 253-257.

Publication

ISSN: 0301-5149
NlmUniqueID: 0427140
Country: Switzerland
Language: English
Volume: 92
Pages: 253-257

Researcher Affiliations

Barrandeguy, M
  • Instituto de Virología CICV-INTA, Castelar, Buenos Aires, Argentina.
Parreño, V
    Lagos Mármol, M
      Pont Lezica, F
        Rivas, C
          Valle, C
            Fernandez, F

              MeSH Terms

              • Animals
              • Diarrhea / prevention & control
              • Diarrhea / veterinary
              • Female
              • Horse Diseases / prevention & control
              • Horses
              • Infectious Disease Transmission, Vertical / prevention & control
              • Pregnancy
              • Rotavirus Infections / prevention & control
              • Rotavirus Infections / veterinary
              • Vaccines, Inactivated / therapeutic use
              • Viral Vaccines / therapeutic use

              Citations

              This article has been cited 19 times.
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