Sign up now!
Don't show this again
Download the report!Continue to Site >
or wait 7 secs

Thank you for confirming your subscription!

(And remember, if ever you want to change your email preferences or unsubscribe, just click on the links at the bottom of any email.)

We’re glad you’re enjoying Pig Health Today.
Access is free but you’ll need to register to view more content.
Already registered? Sign In
Tap to download the app


Collect articles and features into your own report to read later, print or share with others

Create a New Report


Read Later

Create a new report

Report title (required) Brief description (optional)
follow us

You must be logged in to edit your profile.

Favorites Read Later My Reports PHT Special Reports
Pig Health Today is equipped with some amazing (and free) tools for organizing and sharing content, as well as creating your own magazines and special reports. To access them, please register today.
Sponsored by Zoetis

Pig Health Today | Sponsored by Zoetis

Featured Video Play Icon

Some aspects of Senecavirus A continue to mystify researchers

While the spikes of Senecavirus A (SVA) have plateaued in recent years, researchers in the pork industry are still confounded by the elusive virus and what triggers outbreaks.

“We don’t see the large seasonal spikes that we did early on in 2015 and 2016,” Matthew Sturos, DVM, a diagnostic pathologist at the University of Minnesota, told Pig Health Today.

Fortunately, he added, incidence in the years “2017 and 2018 have been fairly static and we don’t really know the reason, but it does seem to be a persistent problem.”

SVA is a small, hardy, non-enveloped virus. Between 1988 and 2015, only a handful of cases were confirmed in the US.

Brazil was the first country to report large SVA outbreaks in 2014 and 2015, Sturos noted. Shortly afterward, several other countries around the world reported large outbreaks, including China, Canada and the US, which reported hundreds of cases. The reasons for the dramatic rise in numbers remain unclear.

Daunting questions

While scientists are learning more about SVA all the time, Sturos said, they have little history to go on.

“We’ve had 30 years to work with porcine reproductive and respiratory syndrome (PRRS), and we’ve had about 3 [years] to work with Seneca Valley Virus, and so there are a lot of unknown questions,” he said.

“How much antibody is antibody protective? How much do you need? And how long after an animal is exposed is it immune? We don’t know those answers. And this does make it difficult to predict.”

Mimics FMD

SVA mimics foot-and-mouth disease, a transboundary illness that can cause heart disease in young animals, he said. He added that there are clinical reports of increased neonatal loss or death in week 1 on farms infected with SVA.

He said many of the findings about the impact of the virus are variable.

“And that’s what makes it difficult,” he said. “The consistent findings in these affected animals [show] they often have diarrhea, they’re infected within the first week of life, and it can be sporadic within the farm. You might have one litter that’s affected, and you have another one right next to it that’s not.”

He said increased biosecurity is the best way to keep the disease away from farms.

“The preventative measures that are in place for the other endemic diseases — PRRS, porcine epidemic diarrhea — those are all important factors,” he said. “Being careful about animals that you bring in; being careful about the equipment, personnel, how you move through your facilities — those are all going to be important in preventing introduction into a herd.”

Posted on May 25, 2019

tags: , , ,

You must be logged in to edit your profile.

Share It
It’s not unrealistic to say that if you checked the nasal cavities or tonsils of any group of pigs, you would find Strep suis. While the strain and impact can vary widely, this commensal bacterium is on virtually every hog farm.

Click an icon to share this information with your industry contacts.

Google Translate is provided on this website as a reference tool. However, Poultry Health Today and its sponsor and affiliates do not guarantee in any way the accuracy of the translated content and are not responsible for any event resulting from the use of the translation provided by Google. By choosing a language other than English from the Google Translate menu, the user agrees to withhold all liability and/or damage that may occur to the user by depending on or using the translation by Google.