| pcr-based retrospective evaluation of diagnostic samples for emergence of porcine deltacoronavirus in us swine. | porcine deltacoronavirus (pdcov) was first identified in hong kong in a regional surveillance study for coronaviruses in 2012 and was detected for the first time in united states (us) swine in february 2014. however, it remains unknown if pdcov had been introduced into the us prior to that time period. in the present study, 1734 clinical samples (903 cases) submitted to the iowa state university veterinary diagnostic laboratory (isu vdl) for enteric disease diagnosis between october 2012 and dec ... | 2015 | 26119039 |