Medical News Today, June 2, 2008 UTMB researchers have developed new vaccines to protect against West Nile and Japanese encephalitis viruses. The investigators created the vaccines using an innovative technique that they believe could also enable the development of new vaccines against other diseases, such as yellow fever and dengue fever, which are caused by similar viruses. Peter Mason of the UTMB departments of pathology and microbiology and immunology, and colleagues reported their findings in back-to-back papers published in the current issue of the journal Vaccine.