Medical Xpress: PHYSorg news tagged with: trivalent vaccine http://medicalxpress.com/ en-us Medical Xpress internet news portal provides the latest news on Health and Medicine. Four works better than three: An enhanced flu vaccine does the trick An intranasal vaccine that includes four weakened strains of influenza could do a better job in protecting children from the flu than current vaccines, Saint Louis University research shows. http://medicalxpress.com/news/2012-04-flu-vaccine.html Immunology Wed, 04 Apr 2012 10:15:57 EST news252753351