HIV Wasting SyndromeWasting SyndromeCircovirusPorcine Postweaning Multisystemic Wasting SyndromeCircoviridae InfectionsSwine DiseasesParvovirus, PorcineSyndromeSwineCircoviridaeHIV InfectionsWeaningTeschovirusAsymptomatic InfectionsHyponatremiaInappropriate ADH SyndromeCachexiaPorcine Reproductive and Respiratory SyndromeLymph NodesPolymerase Chain ReactionParvoviridae InfectionsDNA, ViralHIV SeropositivityAcquired Immunodeficiency SyndromeDown SyndromeMetabolic Syndrome XAntibodies, ViralIn Situ HybridizationGenome, Viral