SCIENTIST USE DENTAL FLOSS TO DELIVER VACCINES 

Yes, researchers have developed a novel vaccine delivery method that uses specially coated dental floss to deliver vaccines without needles in early-stage studies. The research, published in Nature Biomedical Engineering, shows promising results in mice and early feasibility tests in humans.How It WorksThe technique leverages the high permeability of the gingival sulcus, the small pocket of tissue between the teeth and gums. This area, known as the junctional epithelium, is naturally less of a barrier than other epithelial tissues, allowing vaccine molecules to be absorbed directly into the bloodstream and the body's mucosal immune system.Key Findings and PotentialThe floss-based method has demonstrated several advantages in animal models:

• Strong Immune Response: Mice that received a flu vaccine via the coated floss developed robust systemic and mucosal antibody responses, comparable to or superior to some nasal or sublingual vaccines. All vaccinated mice survived exposure to a lethal flu strain, while unvaccinated mice died.
• Versatility: The approach worked effectively with various vaccine types, including proteins, inactivated viruses, and mRNA vaccines.
• Ease of Use & Distribution: The vaccine coating dries on the floss, making it stable without refrigeration (no "cold chain" required), which could make distribution easier and cheaper, especially in low-resource areas.
• Addresses Needle Phobia: As a painless, needle-free option, it could improve vaccine uptake in people who fear injections. 

Next Steps and Limitations

While the results are encouraging, the method is still in its early stages:

• Human Trials Needed: The next phase will involve clinical trials to establish safety and efficacy in humans. A small feasibility study with human volunteers showed that floss picks could reliably deliver a dye to the gums, but more research is required to ensure consistent dosing.
• Limitations: The method is not suitable for infants and toddlers without teeth. Researchers also need to determine its effectiveness and safety in individuals with gum disease or other oral infections.

Researchers envision a future where this method could be self-administered at home or even incorporated into routine dental visits

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