SAN FRANCISCO--(BUSINESS WIRE)--Fitch Ratings has assigned an 'AA-' rating to the approximately $100,000,000 Oregon Health and Science University (OHSU) revenue bonds series 2015C (federally taxable). In addition, Fitch has upgraded the rating on OHSU's outstanding debt to 'AA-' from 'A+', as listed at the end of the press release. The Rating Outlook is revised to Stable from Positive. Proceeds from the series 2015C taxable fixed-rate bonds will be used for general corporate purposes. The bonds