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Efficacy of an attenuated European subtype 1 porcine reproductive and respiratory syndrome virus (PRRSV) vaccine in pigs upon challenge with the East European subtype 3 PRRSV strain Lena

Ivan Trus (UGent) , Caroline Bonckaert (UGent) , Karen van der Meulen (UGent) and Hans Nauwynck (UGent)
Author
Organization
Abstract
The efficacy of a commercial attenuated European subtype 1 PRRSV vaccine was evaluated upon challenge with the East European subtype 3 PRRSV strain Lena (83.3% nucleotide identity). Two vaccination experiments were carried out. Four- and seven-week-old pigs were vaccinated with the modified-live vaccine. Upon vaccination, virus specific IPMA antibodies were detected in all vaccinated animals with titers ranging from 10(2.8) to 10(4.6). No virus neutralizing (VN) antibodies were detected after vaccination. Eight (exp. 1) or six (exp. 2) weeks after vaccination, pigs were challenged with 10(6) (exp. 1) resp. 10(5) (exp. 2) TCID50 of the European subtype 3 PRRSV Lena. Upon challenge, non-vaccinated animals showed fever during 5.1 (exp. 1) or 7.7 (exp. 2) days. In vaccinated pigs, the duration of fever was reduced by 1.8 (exp. 1) or 3.5 (exp. 2) days. The modified-live virus vaccine reduced the mean duration of nasal shedding and viremia. In non-vaccinated pigs, virus shedding lasted 5.8 days (exp. 1), resp. 8.3 days (exp. 2). This period was reduced to 3.6 (exp. 1), resp. 3.0 (exp. 2) days in vaccinated animals. Viremia was observed during a shorter period in vaccinated (exp. 1: 7.4 days, exp. 2: 4.8 days) than in non-vaccinated groups (exp. 1: 11.8 days, exp. 2: 12.3 days). Starting from 5 days post challenge, virus titers in nasal secretions and sera were significantly lower in vaccinated animals (P<0.05). Virus-neutralizing antibodies were detected at low titers (≤16) after 7 days post challenge in vaccinated animals and 28 days post challenge in control animals. In conclusion, it can be stated that vaccination of pigs with an attenuated European subtype 1 vaccine provides a partial protection against a subsequent exposure to the highly pathogenic East European subtype 3 PRRSV strain Lena.

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MLA
Trus, Ivan, Caroline Bonckaert, Karen van der Meulen, et al. “Efficacy of an Attenuated European Subtype 1 Porcine Reproductive and Respiratory Syndrome Virus (PRRSV) Vaccine in Pigs Upon Challenge with the East European Subtype 3 PRRSV Strain Lena.” Porcine Health Management, 6th European Symposium, Abstracts. 2014. 122–122. Print.
APA
Trus, I., Bonckaert, C., van der Meulen, K., & Nauwynck, H. (2014). Efficacy of an attenuated European subtype 1 porcine reproductive and respiratory syndrome virus (PRRSV) vaccine in pigs upon challenge with the East European subtype 3 PRRSV strain Lena. Porcine Health Management, 6th European symposium, Abstracts (pp. 122–122). Presented at the 6th European symposium of Porcine Health Management (ESPHM 2014).
Chicago author-date
Trus, Ivan, Caroline Bonckaert, Karen van der Meulen, and Hans Nauwynck. 2014. “Efficacy of an Attenuated European Subtype 1 Porcine Reproductive and Respiratory Syndrome Virus (PRRSV) Vaccine in Pigs Upon Challenge with the East European Subtype 3 PRRSV Strain Lena.” In Porcine Health Management, 6th European Symposium, Abstracts, 122–122.
Chicago author-date (all authors)
Trus, Ivan, Caroline Bonckaert, Karen van der Meulen, and Hans Nauwynck. 2014. “Efficacy of an Attenuated European Subtype 1 Porcine Reproductive and Respiratory Syndrome Virus (PRRSV) Vaccine in Pigs Upon Challenge with the East European Subtype 3 PRRSV Strain Lena.” In Porcine Health Management, 6th European Symposium, Abstracts, 122–122.
Vancouver
1.
Trus I, Bonckaert C, van der Meulen K, Nauwynck H. Efficacy of an attenuated European subtype 1 porcine reproductive and respiratory syndrome virus (PRRSV) vaccine in pigs upon challenge with the East European subtype 3 PRRSV strain Lena. Porcine Health Management, 6th European symposium, Abstracts. 2014. p. 122–122.
IEEE
[1]
I. Trus, C. Bonckaert, K. van der Meulen, and H. Nauwynck, “Efficacy of an attenuated European subtype 1 porcine reproductive and respiratory syndrome virus (PRRSV) vaccine in pigs upon challenge with the East European subtype 3 PRRSV strain Lena,” in Porcine Health Management, 6th European symposium, Abstracts, Sorrento, Italy, 2014, pp. 122–122.
@inproceedings{4404717,
  abstract     = {The efficacy of a commercial attenuated European subtype 1 PRRSV vaccine was evaluated upon challenge with the East European subtype 3 PRRSV strain Lena (83.3% nucleotide identity). Two vaccination experiments were carried out. Four- and seven-week-old pigs were vaccinated with the modified-live vaccine. Upon vaccination, virus specific IPMA antibodies were detected in all vaccinated animals with titers ranging from 10(2.8) to 10(4.6). No virus neutralizing (VN) antibodies were detected after vaccination. Eight (exp. 1) or six (exp. 2) weeks after vaccination, pigs were challenged with 10(6) (exp. 1) resp. 10(5) (exp. 2) TCID50 of the European subtype 3 PRRSV Lena. Upon challenge, non-vaccinated animals showed fever during 5.1 (exp. 1) or 7.7 (exp. 2) days. In vaccinated pigs, the duration of fever was reduced by 1.8 (exp. 1) or 3.5 (exp. 2) days. The modified-live virus vaccine reduced the mean duration of nasal shedding and viremia. In non-vaccinated pigs, virus shedding lasted 5.8 days (exp. 1), resp. 8.3 days (exp. 2). This period was reduced to 3.6 (exp. 1), resp. 3.0 (exp. 2) days in vaccinated animals. Viremia was observed during a shorter period in vaccinated (exp. 1: 7.4 days, exp. 2: 4.8 days) than in non-vaccinated groups (exp. 1: 11.8 days, exp. 2: 12.3 days). Starting from 5 days post challenge, virus titers in nasal secretions and sera were significantly lower in vaccinated animals (P<0.05). Virus-neutralizing antibodies were detected at low titers (≤16) after 7 days post challenge in vaccinated animals and 28 days post challenge in control animals. In conclusion, it can be stated that vaccination of pigs with an attenuated European subtype 1 vaccine provides a partial protection against a subsequent exposure to the highly pathogenic East European subtype 3 PRRSV strain Lena.},
  articleno    = {O47},
  author       = {Trus, Ivan and Bonckaert, Caroline and van der Meulen, Karen and Nauwynck, Hans},
  booktitle    = {Porcine Health Management, 6th European symposium, Abstracts},
  language     = {eng},
  location     = {Sorrento, Italy},
  pages        = {O47:122--O47:122},
  title        = {Efficacy of an attenuated European subtype 1 porcine reproductive and respiratory syndrome virus (PRRSV) vaccine in pigs upon challenge with the East European subtype 3 PRRSV strain Lena},
  year         = {2014},
}