New nasal spray vaccine shows promise against multiple respiratory illnesses and allergies in mice

US researchers have developed a nasal spray vaccine in mice that shows promise for protecting against a range of respiratory viruses, bacteria, and allergens. The experimental vaccine, tested on mice, demonstrated effectiveness against influenza, staph infections, and a drug-resistant bacterium. It also showed potential for allergy protection. While promising, human trials are years away, with experts estimating at least a decade before it could be widely available due to necessary evaluations.