Researchers are exploring a new nasal spray designed to protect against respiratory illnesses like colds, flu, and COVID-19. The spray, developed by Brigham and Women's Hospital, uses a unique formulation called PCANS (Pathogen Capture and Neutralizing Spray). This spray coats the nasal cavity, capturing large respiratory droplets and neutralizing various pathogens, including bacteria and viruses, effectively creating a physical barrier. Once captured, the spray neutralizes these pathogens, preventing them from spreading further. By targeting this area, the spray could significantly reduce the transmission of respiratory illnesses. This innovation offers a promising way to block the spread of airborne respiratory infections at their point of entry. Researchers are optimistic that this could be a game-changer in public health, providing a new tool for preventing infections before they even take hold.