CAMBRIDGE, Mass.--(BUSINESS WIRE)--Tetragenetics Inc., a biotechnology company focused on the development of recombinant vaccines, today reported preclinical study results showing that an investigational nanoparticle-based influenza vaccine protects against a highly pathogenic H5N1 avian influenza strain. The study was conducted by scientists at the Institute for Antiviral Research of Utah State University in Logan, Utah and Tetragenetics under a contract sponsored by the National Institute of Allergy and Infectious Diseases (NIAID), part of the National Institutes of Health.