Effects of different US isolates of porcine reproductive and respiratory syndrome virus (PRRSV) on blood and bone marrow parameters of experimentally infected pigs

P. G. Halbur, F. J. Pallarés, J. A. Rathje, R. Evans, W. A. Hagemoser, P. S. Paul, X. J. Meng

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Seventy five-week-old, crossbred, caesarean-derived, colostrum-deprived pigs were randomly divided into five groups of 14 pigs and assigned one of five treatments: the intranasal inoculation of 105-7 TCID50 of one of four plaque-purified isolates of porcine reproductive and respiratory syndrome virus (PRRSV) (VR2385, VR2431, ISU-984 and ISU-22), or uninfected cell culture and media. Haematological variables were measured for 21 days and bone marrow was analysed when the pigs were killed three, seven, 10, 21 or 28 days after the inoculation. The PRRSV-infected pigs had non-regenerative anaemia and markedly increased myeloid:erythroid ratios from three to 21 days after inoculation. There was a significant (P<0-05) difference in the severity of the anaemia induced by the four PRRSV isolates; the most highly pneumovirulent strains (VR2385, ISU-984 and ISU-22) induced more severe anaemia than the least virulent isolate (VR2431). The anaemia induced by PRRSV was probably due to a direct or indirect effect on erythroid precursor cells in the bone marrow.

Original languageEnglish (US)
Pages (from-to)344-348
Number of pages5
JournalVeterinary Record
Volume151
Issue number12
DOIs
StatePublished - Sep 21 2002

ASJC Scopus subject areas

  • veterinary(all)

Fingerprint Dive into the research topics of 'Effects of different US isolates of porcine reproductive and respiratory syndrome virus (PRRSV) on blood and bone marrow parameters of experimentally infected pigs'. Together they form a unique fingerprint.

Cite this