The Swine Health Information Center’s (SHIC) April Domestic Swine Disease Monitoring Report is available.
This month’s Domestic Swine Disease Monitoring Report brings information about the seasonal decrease in PRRSV case positivity, mainly in wean-to-finish sites. However, Iowa and North Carolina had higher PRRSV case positivity compared to historical data. Also, Iowa has a high diversity of strains circulating, with 26 PRRSV variants detected in 2025. PRRSV lineage 1C.5 detections continue to increase, reaching more than 600 detections in 2025. The report includes a bonus page about TGEV, including details on four years without a single positive case. More than 176,000 cases were submitted across six VDLs, with more than 500,000 RT-PCRs performed and not a single PCR-positive TGEV case. PEDV and PDCoV facilities’ case positivity decreased in March, but overall positivity was above the expected in Indiana. Mycoplasma hyopneumoniae case positivity in sow farms decreased, maintaining the promising trend of reduced activity of this pathogen in sow farms. PCV2 case positivity by PCR remains high in the wean-to-market category. However, the PCR Ct values are not as low as in previous periods of PCV2 activity.