Foetal lymph node and spleen proliferation responses following stimulation with NCA for 5 days. Samples of foetal hepatic lymph node (HLN), mesenteric LN (MLN) and and spleen were collected at post mortem examination. Samples were stimulated with NCA for 5 days (37° C in a humidified 5% CO2 atmosphere), with 18.5 kBq 3H Thymidine / well being added for the final 18 h, before being harvested onto glass-fibre filters. The data were log-transformed (base 10) before analysis by a linear model. The predicted mean responses (counts per minute (cpm) on log10 scale) (Infected -■-, Control -∆-) and 95% confidence intervals (error bars) of foetal spleen and lymph node on (A) 14 dpi, (B) 28 dpi, (C) 42 dpi and (D) 56 dpi are presented).