Table 3

Percentages of samples with negative IFAT IgM phase II, low-positive IgM phase II, and high-positive IgM phase II results

Time point% of samples with IgM phase II result (endpoint dilution)
Negative (<1:32)Low positive (1:32–1:256)High positive (>1:256)
Month 0a71.423.84.8
Month 31.715.782.6
Month 611.634.753.7
Month 1216.064.020.0
  • a Two positive samples were not diluted further because sera were lost. Therefore, percentages are based on 120 sera.