Dr. Peter Davies is finishing up his sabbatical year, spent in the Presidential Advisory Council on Combating Antibiotic-Resistant Bacteria and is talking about European regulations on antimicrobials in the National Hog Farmer.
Our graduate students did a fantastic job at the 24th IPVS and we would like to congratulate them all for their hard work. Among them, Dr. Talita Resende won the IPVS award for best poster. Talita is a PhD candidate at the University of Minnesota under the supervision of Dr. Fabio Vannucci and she presented a poster on A novel diagnostic platform for in situ detection and subtyping of Rotaviruses and Influenza A in pigs.
Dr. Mike Murtaugh’s team just recently published a scientific article in Veterinary Microbiology assessing the difference in Porcine Circovirus type 2 (PCV2) prevalence in the US between 2006 and 2012. The conclusion of their study is that the widespread utilization of effective vaccines dramatically decreased the prevalence of the virus in American herds.
Abstract: Porcine circovirus type 2 (PCV2), a small, single-stranded circular DNA virus and the causative agent of porcine circovirus associated disease (PCVAD), was first observed in the mid-1990s in pigs with a post-weaning wasting disease. In 2006 the number of PCVAD cases greatly increased, marking it as an important viral pathogen for the United States (US) swine industry. PCV2 vaccines were introduced to the US in 2006 in response to widespread outbreaks of PCVAD. These vaccines were effective in preventing disease, but did not eliminate virus from the animals. In 2006, prior to vaccine use, a study of PCV2 prevalence in pig herds across the US was performed in conjunction with the US National Animal Health Monitoring System. In 2012, 6 years after widespread PCV2 vaccination, this study was repeated. Since the introduction of PCV2 vaccines in 2006, viral presence and viral loads have greatly decreased, and a genotypic shift dominated by PCV2b has occurred. Antibody levels have decreased in the pig population, but approximately 95% of sites continue to be antibody-positive. Widespread vaccination has controlled PCVAD and decreased PCV2 prevalence to the point that viremia is not detected on many sites. Thus, continued vaccination may lead to PCV2 elimination in the national herd over time.
Starting June 7th in Dublin, Ireland will be held the 24th International Pig Veterinary Society (IPVS) congress regrouping swine veterinarians from around the world exchanging and presenting the latest information relevant to the profession. Numerous members of the University of Minnesota swine group will be present and some of them have been chosen to present their work.
Carl Betlach will be presenting his results on the evaluation of time to stability and associated risk factors in sow herds infected with PRRS 1-7-4 on Wednesday, June 8th at 1:50pm.
Thursday June 9th at 2:10pm, Dr. Fabian Chamba will share the results of his study on the effect of sow vaccination on the detection of influenza A virus in pigs at weaning.
Dr. Maria Pieters will be presenting her point of view on the management of Mycoplasma hyopneumoniae gilt acclimation on Friday, June 10th at 11:30am.
Earlier in that same session, Dr. Luiza Roos will give the conclusions of her investigation on the optimal seeder-to-naive ratio needed in natural exposure to Mycoplasma hyopneumoniae.
Drs. Bob Morrisson and Mike Murtaugh will both be chairing sessions, on herd health management and immunology, respectively.
On Saturday, May 7th was held the graduation ceremony for the 2016 DVM students as well as for the graduate students enrolled in the VMED program.
Among them, the UMN swine group is happy to announce the graduation of Drs. Carmen Alonso, Nitipong Homwong, Catalina Picasso, and Jisun Sun.
Please join us in congratulating them for their academic success!
It is our distinct pleasure and a great honor to announce that Dr. Bob Morrison has been selected to be one of this year Masters of the Pork Industry. This title, delivered by the National Hog Farmer recognizes individuals who dedicated their careers to the advancement of pork production. As said by the magazine, those leaders are “professionals, entrepreneurs and family-based pork industry enthusiasts whose dedication and wisdom are sure to inspire young and old as they tackle the challenges and opportunities that lie ahead in an ever-changing global pork industry.”
Among all of the great work Dr. Morrison is doing with the industry, we will mention the Swine Health Monitoring Program (SHMP), a collaborative effort from 26 pork producers who voluntarily share their data about disease outbreaks they may be experiencing. While the program started with three pork producers focusing on Porcine Reproductive and Respiratory Syndrome, it has expended to almost 40% of the sows in the US and has included other pathogens like Seneca Valley virus.
Under Dr. Morrison’s leadership, the Allen D. Leman conference and its counterpart Leman China have been created. Those two conferences, which motto is “science-driven solutions” aim at providing the latest and the most relevant information in swine health and production to all of the industry players. The next conference will be held in St. Paul from September 17th to September 20th. More information can be found here.
Please join us in congratulating Dr. Morrison for this great accomplishment.
A scientific paper published today in PLOS ONE reveals that based on three-level mixed-effects logistic regression models, the epidemiology of swine rotaviruses in North America is quite complex. The goal of the study led by Drs. Homwong, Perez, Rossow, and Marthaler from the University of Minnesota was to investigate the associations among age, rotavirus detection, and regions within the US swine production in samples submitted for diagnosis to the Minnesota Veterinary Diagnostic Laboratory.
Percentages of Rotavirus A (RVA), Rotavirus B (RVB), and Rotavirus C (RVC) samples by state. The color represented highest prevalence of the RV species (green represents RVA, purple represents RVB, blue represents RVC while pink represents equal percentages of RVA and RVC
Abstract: Rotaviruses (RV) are important causes of diarrhea in animals, especially in domestic animals. Of the 9 RV species, rotavirus A, B, and C (RVA, RVB, and RVC, respectively) had been established as important causes of diarrhea in pigs. The Minnesota Veterinary Diagnostic Laboratory receives swine stool samples from North America to determine the etiologic agents of disease. Between November 2009 and October 2011, 7,508 samples from pigs with diarrhea were submitted to determine if enteric pathogens, including RV, were present in the samples. All samples were tested for RVA, RVB, and RVC by real time RT-PCR. The majority of the samples (82%) were positive for RVA, RVB, and/or RVC. To better understand the risk factors associated with RV infections in swine diagnostic samples, three-level mixed-effects logistic regression models (3L-MLMs) were used to estimate associations among RV species, age, and geographical variability within the major swine production regions in North America. The conditional odds ratios (cORs) for RVA and RVB detection were lower for 1–3 day old pigs when compared to any other age group. However, the cOR of RVC detection in 1–3 day old pigs was significantly higher (p < 0.001) than pigs in the 4–20 days old and >55 day old age groups. Furthermore, pigs in the 21–55 day old age group had statistically higher cORs of RV co-detection compared to 1–3 day old pigs (p < 0.001). The 3L-MLMs indicated that RV status was more similar within states than among states or within each region. Our results indicated that 3L-MLMs are a powerful and adaptable tool to handle and analyze large-hierarchical datasets. In addition, our results indicated that, overall, swine RV epidemiology is complex, and RV species are associated with different age groups and vary by regions in North America.