Erratum to: Acta Vet Scand (2015) 57:86 DOI 10.1186/s13028-015-0178-z

Unfortunately, the original version of this article [1] contained an error. In the Abstract, Results and Discussion it reads:

The more recently introduced vaccine strains G1 and 431 [16] neutralized 33.3 and 70.5 % (strain G1) or 69.2 and 89.7 % (strain 431) of the field isolates with titres ≥5.

However it should be:

The more recently introduced vaccine strains G1 and 431 [16] neutralized 33.3 and 55.1 % (strain G1) or 69.2 and 89.7 % (strain 431) of the field isolates with titres ≥5.