Nasal vaccine additive improves flu survival in mice even 100 days after treatment

The COVID-19 pandemic showed the challenges of protecting populations erstwhile a caller respiratory microorganism emerges. Although vaccines were developed astatine unprecedented speed, determination was inactive a play erstwhile vaccines were not yet available, and radical remained susceptible to infection. This raises an important question: Could the body's earthy defenses beryllium temporarily strengthened without knowing which microorganism volition emerge?