2007 Annual Report 1a.Objectives (from AD-416) To provide cooperation on investigations of related factors that influence the epidemiology, transmission and oncogencity of avian retroviruses in poultry; develop and evaluate practical and economical methods for detection of avian retrovirus in field flocks; and develop new programs for control of retrovirus infection in poultry including use of newly developed recombinant vaccines. 1b.Approach (from AD-416) Both parties are actively engaged in independent research projects; meeting the objectives of this project will strengthen and enhance ongoing research within the scope of this agreement. 3.Progress Report This report serves to document research conducted under a Memorandum of Understanding between ARS and Michigan State University. This research is conducted in collaboration with Department of Pathobiology and Diagnostic Investigation. One graduate student from this department was assigned to our research unit to conducted research aimed at the molecular and biological characterization of naturally occurring avian leukosis viruses (ALVs). Additional details of research can be found in the report for the parent project 3635-32000-015-00D, Genetic and Biological Determinants of Avian Tumor Virus Susceptibility.