Table 6.

Percent of pigs within treatment groups from which PRRSV was recovered from serum samples^a

Treatment	Days of experiment
n	3	7	10	14	17	21
NPN	7	0a	100a	100a	100a	86a	43a,b
NPD	6	0a	100a	100a	100a	83a	17b
SPN	7	0a	100a	100a	100a	86a	57a,b
SPDb	7†	0a	100a	100a	100a	100a	100a

^aTreatments within a column with the same superscript are not significantly different (p>0.008) using Bonferroni’s Method for pairwise comparisons of proportions.

^bThree pigs in SPD treatment died during the experiment (days 10, 12, and 17).