Immunoglobulin A versus Immunoglobulin G, we still don't know how to stimulate a response (outside of exposure to a virus) to create Immunoglobulin A, which pro

Immunoglobulin A versus Immunoglobulin G, we still don't know how to stimulate a response (outside of exposure to a virus) to create Immunoglobulin A, which protects our upper respiratory tract. This is the technological limits of what vaccines are capable of. Vaccination limits the damage, ensuring a much lower likelihood of catching a 1 to 3 day cold affecting only my upper respiratory tracts rather than risking the lungs and the rest of my body on a potentially multi-week infection. The longer the infection, the more likely pneumonia or another co-infection will injure or kill you.