AI Article Synopsis
- Poultry vaccines are typically given through water-based methods, but gel-based diluents have been created to improve vaccine delivery by allowing droplets to stick to feathers longer for better ingestion.
- A study tested a live Salmonella Typhimurium vaccine, Vaxsafe ST, in different gel media and found that the gel did not harm the vaccine's effectiveness or ability to invade intestinal cells.
- When day-old chicks were given the Vaxsafe ST vaccine in gel, it successfully colonized their caeca, which is important for building strong immunity against infections.*
Article Abstract
Poultry vaccines are often administered using water as a suspension media and applied using an oral or coarse spray method. Gel-based vaccine diluents have been developed as an alternative vaccine delivery method. Gels are more viscous, and droplets adhere more effectively to feathers giving the vaccine a longer time to be ingested (through preening). Application of gel diluents with live bacterial vaccines, however, is limited. The present study tested a gel diluent prepared in various media, using a live, attenuated Salmonella Typhimurium vaccine, Vaxsafe ST. Reconstitution in gel diluent did not negatively affect vaccine viability or motility. The invasive capacity of vaccine suspended in gel diluent into cultured intestinal epithelial cells was also tested. Results demonstrated that vaccine suspended in gel diluent retained invasiveness. Day old chicks were orally administered with Vaxsafe ST suspended in gel diluent to characterize in vivo colonization capacity of the vaccine. The results revealed that the VaxSafe ST suspended in gel diluent could efficiently colonize the caeca of chicks, which is needed for the development of effective immunity.
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| http://dx.doi.org/10.1016/j.vetmic.2023.109721 | DOI Listing |
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