New York. A single vaccine now offers hope for protecting people worldwide from common colds, influenza, lung infections, and even allergies. This 'Universal Vaccine,' developed by researchers at Stanford University in the US, can be administered as a nasal spray.According to scientists, this vaccine fundamentally changes the basic premise of vaccine science. Since Edward Jenner pioneered vaccination in 1796, all previous vaccines taught the body to fight only one specific infection. For example, the measles vaccine fought only measles, and the smallpox vaccine fought only smallpox. However, this new vaccine, instead of training against one specific virus, works to keep...