Table 2.

Serum antibody response in OMP-ELISA from day-old chicks (batch controls) at the time of the inoculation experiments

Experimental group of chicksStrain or day of storage (no. of chicks)ELISA optical density (median and range)a
Dose-response experimentsG97-76595 (9)1.34 (0.87–1.92)
Kl-5133 (9)0.92 (0.19–1.34)
Pen-6 (9)0.11 (0.06–0.15)
Storage experimentsDay 1 (10)0.27 (0.16–0.61)
Day 9 (10)0.23 (0.10–0.36)
Day 19 (10)0.25 (0.13–0.67)
Day 30 (10)0.24 (0.12–0.45)
Day 39 (10)0.21 (0.08–0.33)
  • a Mean optical densities at 490 nm of four negative control sera were 0.060, 0.055, 0.095, and 0.118; and those of three positive sera were 0.45, 1.08, and 1.59.