Duke researchers have opened a new avenue in the attack against influenza viruses by creating a vaccine that encourages the immune system to target a portion of the virus surface that is less variable. Their approach worked well in experiments with mice and ferrets and may lead to more broadly-protective influenza vaccines and less reliance on an annual shot tailored to that year’s versions of the virus. Even with vaccines, influenza kills about a half-million people each year around the world. ...