SHIC Funded MSHMP Annual Report Details Program Growth and Value to US Pork Producers

The Morrison Swine Health Monitoring Project, funded by the Swine Health Information Center, submitted its 2025 annual report for swine disease monitoring and project enhancements. Dr. Cesar Corzo, along with colleagues at the University of Minnesota, detail the outcomes from three project objectives for the past year. Key achievements include adding porcine deltacoronavirus to the list of monitored diseases, assessing requirements to include influenza A virus sequencing information for breeding herds, and supporting the dynamic porcine reproductive and respiratory syndrome virus variant classification system that serves as the basis for the PRRSV Variants Under Monitoring report. Further, project leaders report the continued expansion of producer participation in alignment with increasing inclusivity and representativeness. The MSHMP project data currently accounts for 3.9 million sows and represents approximately 65% of the US breeding herd.

Read the full MSHMP report here.

For 2025, the MSHMP project encompassed three main objectives, including 1) monitoring trends in pathogen incidence and prevalence for PRRSV, PEDV, PDCoV, and Senecavirus A, 2) prospective monitoring of PRRSV sequence evolution and impact, and 3) expanding participation in the voluntary program. Progress was reported on all three objectives.

In the report, Dr. Corzo and colleagues note that the PEDV cumulative incidence trend was different for 2025 when compared to previous years and that a sharp increase was observed during the fall and into the winter months. New to the MSHMP project was the addition of PDCoV to the list of monitored diseases, increasing its impact and value to the industry.

The MSHMP team also explored and developed a method to estimate the breeding herd IAV cumulative incidence in 2025, broadening the program’s deliverables to the US swine industry. While MSHMP confirmed it is possible to estimate cumulative IAV incidence based on veterinary diagnostic lab PCR data, more work needs to be performed to avoid potential underestimation of this metric. Overall, the IAV cumulative incidence ranged between 1% and 5% over the past 10 years.

During 2025, MSHMP continued to curate and expand its PRRSV ORF5 database. The representativeness of this database has enabled the team to closely monitor a newly emerged variant, 1H.18. Further, a new system to monitor emerging variants was developed called VUM, which is now shared publicly every month. The PRRSV VUM report allows producers to better understand the risks associated with each variant that shows rapid dissemination characteristics. Since this report is based on the number of newly infected sites, the industry has an objective measure of variant fitness and risk.

During 2025, MSHMP also assessed the potential to share weekly maps summarizing disease occurrence. While Dr. Corzo and colleagues believe this will be a valuable tool for the industry, further assessment is required to identify pathways to ensure producers and veterinarians are comfortable with sharing such granular data.

MSHMP continues to ensure producer representativeness of data, with a new production system being successfully onboarded in 2025 and two additional systems in the final stages of enrollment, pending submission of required documentation in 2026.

Gaining a better understanding of the health profile of Canadian pigs entering the US was also investigated as a potential valuable addition for data inclusion into MSHMP. Potential participants were approached to explore interest in joining the voluntary project. While interest was expressed, additional evaluation will need to occur before a decision can be made regarding broad producer participation. Continued opportunities for MSHMP expansion are being explored, including weaned pig and grow-finish production.

In addition to expanding participation, the MSHMP project has continued refining and strengthening the dataset by improving key variables of interest, such as air filtration status. This includes ongoing efforts to verify filtration presence and characterize system types (i.e., positive versus negative pressure), in response to stakeholder interest in biosecurity variables. Characterization of mortality management continues for participating breeding herds.

By supporting effective monitoring tools, the MSHMP project continues to provide a mechanism for the tracking and conversion of swine disease data into actionable information that supports preparedness efforts. The collection and dissemination of this information fulfills SHIC’s mission to identify and minimize the impact of emerging swine diseases and support readiness to address potential foreign animal disease emergencies, ensuring a healthier and more secure future for the US swine industry.

The Swine Health Information Center, launched in 2015 with Pork Checkoff funding, protects and enhances the health of the US swine herd by minimizing the impact of emerging disease threats through preparedness, coordinated communications, global disease monitoring, analysis of swine health data, and targeted research investments. As a conduit of information and research, SHIC encourages sharing of its publications and research. Forward, reprint, and quote SHIC material freely. For more information, visit http://www.swinehealth.org or contact Dr. Megan Niederwerder at [email protected] or Dr. Lisa Becton at [email protected].