"Lessons learned and knowledge gaps about the epidemiology and control of porcine reproductive and respiratory syndrome virus in North America" published on 15 Jun 2015 by American Veterinary Medical Association.
No takes yet. Share an insight, caveat, or question.
Perez et al. (2015) studied this question.
Synapse has enriched 4 closely related papers on similar clinical questions. Consider them for comparative context: