TABLE 4

Summary of the serological survey in PRRSV-positive and -negative domestic swine farms by HI assay

Farm and PRRSV statusNo. of sera positivea for B/Yamagata lineagebPositive (%)No. of sera positive for B/Victoria lineagecPositive (%)
Positive
    A4/10 (48)d400/100
    B0/900/90
    C0/600/60
    D29/90 (51)32.248/90 (69)53.3
Negative
    A0/700/70
    B0/900/90
    C0/900/90
    D0/9000/900
  • a Data are the number of positive samples out of the total number tested.

  • b B/Yamagata/16/1988 was used.

  • c B/Brisbane/60/2008 was used.

  • d Numbers in parentheses indicate geometric mean HI titers for samples with a value of ≥40.