fbpx
Sign up now!
Don't show this again

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 Poultry Health Today.
Access is free but you’ll need to register to view more content.
Already registered? Sign In
Tap to download the app
X
Share
X

REPORTS

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

Create a New Report

Favorites

Read Later

Create a new report

Report title (required) Brief description (optional)
CREATE
X
NEXT
POULTRY PORK
follow us


You must be logged in to edit your profile.

Favorites Read Later My Reports PHT Special Reports
Poultry 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

Sponsored By Zoetis

.
X
• • • •   SPECIAL COVID-19 MESSAGE FROM POULTRY HEALTH TODAY   • • • •

The editors of Poultry Health Today are acutely aware of the hardships facing the poultry industry as it responds to plant closures, labor shortages and other challenges resulting from the pandemic.

At the same time, we recognize that maintaining flock health and biosecurity are vital to the industry’s long-term security and sustainability. We therefore will continue to report on the latest news and information to help the poultry industry meet this goal. As always, we welcome your comments and editorial suggestions.

Please click here to contact the editor.

Featured Video Play Icon

Study: Live S. Typhimurium vaccine reduces S. Infantis colonization

Listen to the podcast:

 

Investing in vaccination programs to develop cross-protection against some of the most common strains of Salmonella could help limit the number of foodborne outbreaks of the pathogen, according to a poultry expert.

Charles Hofacre, DVM, PhD, president, Southern Poultry Research Group Inc., said increases in drug-resistant foodborne outbreaks of Salmonella highlighted the need for everyone in the broiler sector to work on reducing incidences of the pathogen.

And he said that vaccinating broilers and breeders could help limit multiple types of Salmonella seen in processing plants, which could in turn reduce food-safety issues.

Speaking to Poultry Health Today, Hofacre said live Salmonella vaccines have been shown to stimulate birds’ immune systems to protect against multiple serotypes.

With vaccines against S. Typhimurium — a group B serotype — already proven to work well against S. Enteritidis — a group D serotype — Hofacre wanted to find out if it could have similar success against S. Infantis, which is a group C1 serotype.

To test the vaccine’s efficacy, in a trial birds were sprayed with a S. Typhimurium vaccine at day of age and given a booster at 14 days in their drinking water.

At 30 days, half of the birds were challenged with S. Infantis, while the rest were allowed to pick up the bacterium naturally, just as they would in a broiler house.

“Those birds we gave it to seed it to the litter, and then the pen mates pick it up,” Hofacre explained.

“So it gives us the opportunity to determine [if] the vaccine helped reduce the amount of colonization in the birds that directly got the Salmonella, [and if it helped] those birds that were horizontally exposed become infected as quickly.”

Environmental samples were taken at processing age — before feed was withdrawn 8 hours before processing — while bird samples were taken from carcass rinses and from the ceca, liver and spleen.

“What we found was that we had a high prevalence in the boot socks in each of the pens,” Hofacre said. “So, the broiler house was very positive for Salmonella, which was not surprising.”

In the birds that weren’t directly challenged but were in the pen with challenged birds, there was a reduction in infection, he added.

“In the internal organs, especially the liver and spleen, we saw a significant reduction in Salmonella in those livers and spleens in birds both directly challenged and indirectly challenged.”

The significance of that reduction goes back to breeders, Hofacre explained.

With breeders vaccinated with the same live Salmonella vaccines, when they begin to lay eggs lower levels of the pathogen will have colonized in their internal organs — meaning less of the bacterium will reach their offspring.

In addition, research by scientists at the University of Georgia has indicated that internal colonization of the liver, spleen and bone marrow could be a source for Salmonella contamination in ground or mechanically separated poultry meat.

“If we can reduce that internal-organ colonization, we may have a reduction in the risk for ground poultry products,” he added.

Hofacre indicated results of the study were conclusive in demonstrating that the live S. Typhimurium vaccine reduced S. Infantis, especially on the liver and spleen positives.




Posted on June 10, 2020

tags: , ,
RELATED NEWS



You must be logged in to edit your profile.

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.