May 8 - Fitch Ratings has affirmed the 'A-' Insurer Financial Strength (IFS) rating of Validus Reinsurance, Ltd. (Validus Re), the principal reinsurance operating subsidiary of Validus Holdings, Ltd. (Validus). Fitch has also affirmed Validus' 'BBB+' Issuer Default Rating (IDR), 'BBB' senior unsecured notes rating, and 'BB+' rating for Validus' junior subordinated debt instruments (see full rating list below). The Rating Outlook remains Positive. The ratings action follows Fitch's normal peri