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A recombination between two Type 1 Porcine Reproductive and Respiratory Syndrome Virus (PRRSV-1) vaccine strains has caused severe outbreaks in Danish pigs.
Kvisgaard LK, Kristensen CS, Ryt-Hansen P, Pedersen K, Stadejek T, Trebbien R, Andresen LO, Larsen LE. Kvisgaard LK, et al. Among authors: ryt hansen p. Transbound Emerg Dis. 2020 Mar 27;67(5):1786-96. doi: 10.1111/tbed.13555. Online ahead of print. Transbound Emerg Dis. 2020. PMID: 32219985 Free PMC article.