In 2015, the Midwestern part of the United States was the theater of an outbreak of a highly pathogenic strain of avian influenza. Drs. Torremorell, Alonso and Davies from the University of Minnesota were involved during the epidemic and just published in Avian Diseases and their findings concerning the airborne transmission of the virus were just published in Avian Diseases.
The study showed that the air exhausted from an infected poultry facility was a source of contamination for the environment but also a risk of transmission for Highly Pathogenic Avian Influenza (HPAI) that needs to be seriously taken into consideration. Indeed, live and infectious virus was found at a distance up to 70m (76.5 yards) from the farm facilities.
Abstract: We investigated the plausibility of aerosol transmission of H5N2 highly pathogenic avian influenza (HPAI) virus during the 2015 spring outbreaks that occurred in the U.S. midwest. Air samples were collected inside and outside of infected turkey and layer facilities. Samples were tested to assess HPAI virus concentration (RNA copies/m3 of air), virus viability, and virus distribution by particle size. HPAI virus RNA was detected inside and up to 1000 m from infected facilities. HPAI virus was isolated from air samples collected inside, immediately outside, up to 70 m from infected facilities, and in aerosol particles larger than 2.1 lm. Direct exposure to exhausted aerosols proved to be a significant source of environmental contamination. These findings demonstrate HPAI virus aerosolization from infected flocks, and that both the transport of infectious aerosolized particles and the deposition of particles on surfaces around infected premises represent a potential risk for the spread of HPAI.
The Minnesota State Fair closed its doors a week ago and once again the Miracle of Birth Center has been a huge success. This attraction, one of the visitors favorite displays cows, sows, does, goats, and hens giving birth and caring for their offspring. Animals are selected based on their estimated delivery date so that at least one birthing happens every day during the Fair.
Drs. Matt Sturos, Jerry Torrison, Alex Bianco, Bob Morrison, Fabio Vannucci, Maria Pieters, and Perle Boyer, faculty members from the swine group at the College of Veterinary Medicine, University of Minnesota as well as Drs. Megan Thompson, Nathan Winkelman, Abigail Redalen and Michael Strobel, professionals from the pork industry volunteered their time and shared their knowledge and expertise with the Minnesotans in order to increase awareness on what is actually happening on an American farm nowadays. Let’s also not forget the great participation of our graduate students, Drs. Talita Resende, Catalina Picasso, Luiza Roos, Jorge Garrido, Michael Rahe, and Fernando Leite.
Among the thousands of visitors admiring new-born calves and piglets, the Miracle of Birth Center had the honor of receiving the visit of the President of the University of Minnesota.
The Miracle of Birth Center has the very noble mission to educate people about modern farm production and we wish it many more successful years!
In this month column of the National Hog Farmer, Dr. Albert Rovira from the University of Minnesota is reviewing the cases of intoxication due to ionophores, these antibiotics given through the feed to control bacterial and coccidial infections in swine.Clinical signs are non-specific. Indeed, pigs become weak and stop eating but do not have a fever. In more severe cases, neurological signs can be noted. However, histological lesions are striking with a dramatic change of the muscle structure as is shown in Figure 1 below.
There are three main causes of ionophore intoxication in swine:
Dosage error in the diet: the optimal concentration is very small, between 15 and 30 parts per milliom.
Mixing ionophore and tiamulin: Tiamulin prevents the ionophore from being excreted by the body, leading to toxic blood levels.
Inclusion of ionophores designed for another species. Usually, the levels are incorporated at a concentration higher than the toxic level.
In conclusion although cases of ionophore intoxication are rare in swine, it may become more prevalent starting in 2017, with the approval of the only swine ionophore as a growth promotant.
Dr. Alonso who just graduated from her PhD at the University of Minnesota, published in collaboration with Drs. Davies, Morrison and Torremorell an article evaluating the electrostatic particle ionization (EPI) technology as a technique to reduce particle load in the air. The results showed that EPI was the most efficient when the system was close to the particle source and when the particle size was between 3.3 and 9 μm no matter what swine pathogen was evaluated. This technique could be promising in decreasing the risk of disease transmission between swine facilities.
This past month, a team of swine pathologists including Dr. Albert Rovira from the University of Minnesota identified, thanks to funds from Swine Health Information Center’s Support for Diagnostic Fees program, a new swine virus called porcine sapelovirus.
This virus is thought to induce atypical neurological signs in pigs and has previously been described in Korea. Videos of the clinical presentation can be been here.
Research is still on-going to prove Koch’s postulate and declare causality between the presence of the virus and the clinical presentation but it is a step forward in the identification and understanding of swine pathogens.