Table 1. Virus isolation and virus titration in PK-15 cells with serums samples at 3 and 4 weeks post-infection.

		3 week post-infection		4 week post-infection
Inoculum	Pig number	Virus isolation	Virus titration a	Virus isolation	Virus titration a
Pinar del Rio strain	1	Negative	Negative	Negative	Negative
	3	Negative	Negative	Negative	Negative
	6	+	10 5. 5	†
	7	+	10 6. 35	+	10 7.00
	9	+	10 5.66	+	10 5. 57
	10	+	10 6. 35	†
	14	Negative	Negative	Negative	Negative
	Sow PR	Negative	Negative	Negative	Negative
Catalonia strain	16	+	10 6.66	†
	17	+	10 6. 57	+	10 6. 20
	19	+	10 7.12	+	10 6.80
	20	+	10 6.66	+	10 7.16
	21	+	10 6. 57	+	10 6.49
	23	+	10 6.66	+	10 6.66
	25	+	10 6.75	+	10 6.71
	27	+	10 6. 57	+	10 7.00
	28 b	+	10 7.00	†
	Sow Cat	Negative	Negative	Negative	Negative

Negative: The virus isolation was negative.

Symbol +: The virus isolation was positive.

Symbol †: Dead

^a: Virus Titration in TCID 50/mL

^b: sample from pig 28 analysed at 19 dpi