Table 1.

List of experimental groups

Group (number of piglets)	Immunization protocol SC/SC/IN/INB; age in days at immunization
Piglets from OVA–S
OVA–P (n = 8)	Control (non-immunized)
OVA–P 7D (n = 5)	7/17/27/62
OVA–P 14D (n = 5)	14/24/34/69
Piglets from OVA+S
OVA+P (n = 8)	Transfer group (anti-OVA MatAb)
OVA+P 7D (n = 6)	7/17/27/62
OVA+P 14D (n = 8)	14/24/34/69

SC, subcutaneous; IN, intranasal; INB, IN boost; 7D, 7-day old piglets; 14D, 14-day-old piglets; OVA–S, OVA-seronegative sow; OVA–P, OVA-seronegative piglets; OVA–P 7D and OVA–P 14D, OVA-seronegative piglets immunized at 7 or 14 days of age with OVA; OVA+S, OVA-seropositive sow; OVA–P, OVA-seronegative piglets; OVA+P 7D and OVA+P 14D, OVA-seropositive piglets immunized at 7 or 14 days of age with OVA.