Differences in susceptibility of Duroc, Hampshire, and Meishan pigs to infection with a high virulence strain (VR2385) of porcine reproductive and respiratory syndrome virus (PRRSV)

P. G. Halbur, M. F. Rothschild, B. J. Thacker, X. J. Meng, Prem S Paul, J. D. Bruna

Research output: Contribution to journalArticle

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Abstract

The objective of this research was to determine if there is genetic influence on the resistance or susceptibility to PRRSV-induced disease and lesions. Pigs of three breeds from two or three litters per breed were randomly assigned to treatment or control groups. Treatment consisted of inoculation with a well characterized, high virulence strain (VR2385) of PRRSV. Duroc, Hampshire, and Meishan pigs were weaned at 9-10 days of age and inoculated with PRRSV at 22-38 days of age. Animals were housed and cared for according to approved animal use and care standards. Pigs were inoculated intranasally with 5 ml of cell culture media containing 105.8 TCID50 of PRRSV VR2385. Controls were mock-infected. Clinical disease scores and rectal temperatures were recorded daily. Macroscopic lung lesion scores were estimated at necropsy at 10 days post inoculation. All organ systems were examined microscopically in a blinded fashion. Serum antibody response was measured by an indirect immunofluorescence assay. Hampshire pigs had significantly more severe macroscopic lung lesion scores (43.0 ± 3.7) than Duroc (29.43 ± 3.3) or Meishan (25.0 ± 3.5) pigs. Meishan pigs had significantly less PRRSV antigen detected in the lungs. Significantly more Meishan pigs had myocarditis and encephalitis. Duroc pigs had significantly lower normalized serum antibody titres to PRRSV. Differences in severity and distribution of PRRSV-induced lesions, and in normalized serum antibody response to PRRSV may be in part influenced by pig genetic factors. The ability to select animals which are less susceptible to the devastating consequences of PRRSV infection would be of tremendous value to the swine industry.

Original languageEnglish (US)
Pages (from-to)181-189
Number of pages9
JournalJournal of Animal Breeding and Genetics
Volume115
Issue number3
StatePublished - Dec 1 1998

Fingerprint

Porcine respiratory and reproductive syndrome virus
Hampshire (swine breed)
Meishan
Porcine reproductive and respiratory syndrome virus
Duroc
Virulence
virulence
Swine
swine
Infection
infection
lesions (animal)
lungs
Virus Diseases
antibodies
Lung
Antibody Formation
pork industry
Rectal Diseases
Serum

ASJC Scopus subject areas

  • Food Animals
  • Animal Science and Zoology

Cite this

Differences in susceptibility of Duroc, Hampshire, and Meishan pigs to infection with a high virulence strain (VR2385) of porcine reproductive and respiratory syndrome virus (PRRSV). / Halbur, P. G.; Rothschild, M. F.; Thacker, B. J.; Meng, X. J.; Paul, Prem S; Bruna, J. D.

In: Journal of Animal Breeding and Genetics, Vol. 115, No. 3, 01.12.1998, p. 181-189.

Research output: Contribution to journalArticle

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