Needle-free vaccines

Medical Breakthroughs: Do Nasal Flu Vaccines Work?

Needle-free vaccines may offer broad protection against the flu. A study at Georgia State University finds vaccines sprayed into the nose enhance the immune response in respiratory tracts, where viruses enter the body. That could make intranasal vaccines more effective than shots injected into the muscle. More American children are getting vaccinated against the human papillomavirus— but doctors say the…