Scientists are developing a simple nose spray that could protect against many types of colds and flu at once. Early tests show it wakes up the body’s defenses right where germs enter: your nose and throat. This mucosal immunity approach is significantly more effective than traditional intramuscular shots for respiratory viruses because it stops the infection before it takes hold in the lungs. For public health leaders, this represents a scalable, needle-free solution to seasonal surge pressures on healthcare systems.
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