Figure 4From: Age-dependent resistance to Porcine reproductive and respiratory syndrome virus replication in swineEffect of pig age and PRRSV strain on interferon (IFN) γ-secreting cell frequencies in peripheral blood mononuclear cells (PBMC). Panels A-C, control uninfected pigs (4-5 pigs per group); D-F, pigs inoculated with attenuated ATP PRRSV (5-8 pigs per group); G-I, pigs infected with virulent JA142 (10-11 pigs per group). Panels A, D, and G, PBMC cultured without stimulation; B, E, and H, PBMC cultured with JA142 PRRSV; C, F, and I; PBMC cultured in presence of phytohemagluttinin (PHA). In each panel, piglets are open squares, finisher pigs are open circles, and sows are closed circles. Asterisk in panels F and I indicate wells with too many cells to count, i.e. >400 per well.Back to article page