The latest Swine Health Information Center (SHIC) monitoring report points to encouraging progress in the fight against Mycoplasma hyopneumoniae, a pathogen long associated with respiratory disease, lost performance, and added costs in pork production.
Historic Drop in Cases
According to SHIC’s August domestic swine disease monitoring report, the percentage of positive Mycoplasma hyopneumoniae cases in U.S. sow farms fell in July to its lowest level in 13 years. Tissue diagnoses during the second quarter of 2025 were also reported at very low levels.
Expert Perspective
Dr. Lisa Becton, SHIC Associate Director, says the findings are clear evidence of progress:
“This month’s report showed the lowest monthly case positivity in sows since 2012. It’s very positive to see the reduction of cases across all ages. Producers and their veterinarians have been focused on elimination and stabilization strategies, and the decline in case positivity demonstrates a lot of success in the field.”
What It Means for Producers
Mycoplasma hyopneumoniae is a common cause of pneumonia in pigs, often recognized by a persistent dry cough, respiratory stress, and reduced growth performance. Its global presence has made it a costly and difficult challenge for producers.
The new report highlights the impact of ongoing elimination and mitigation strategies, including herd stabilization programs, veterinary oversight, and coordinated producer efforts. Dr. Becton notes that the continued downward trend could pave the way for more widespread elimination efforts across the industry in the future.
