The Search for More Effective Vaccines
Without question, but vaccines aren't producing the ironclad immune defense they did initially. Scientists have high hopes for nasal spray boosters, which could be key to limiting infections. The current mRNA-based vaccines, injected into a muscle, induce strong immunity in the blood, preventing severe illness, but appear to cause a more limited immune response in the airways where the virus enters the body. A nasal vaccine could stimulate an immune response in the mucosa — the tube lining that runs from the nose and mouth to the lungs and stomach. That's much better!
Photo Credit: Diana Polekhina