Prof Hans Nauwynck is attached to the Faculty of Veterinary Medicine at Ghent University in Belgium. Viral diseases are at the core of his attention \u2013 and they will take centre stage in this episode of \u201cMeet the Expert\u201d. He will discuss reproductive failure in pigs, with particular attention for the viral component of that problem: PCV2, PRRS virus and parvovirus will be discussed.