NAYlXAL SCIENCE FOUI\IDATION AIX13Ofry COl&ITTZ BIOLOGICAL AND ivEDICAL SCIENCES PROPOSAL RATING SHEET No. El-2067 Title Viral and rickettsial. replication in cells Investigator Institution ?Vj.lliam A. Cassel Hahnemann h4ed Co1 . score Signature From 5 (low) to 1 (high)