OLDWICK, N.J.–(BUSINESS WIRE)–A.M. Best has upgraded the Long-Term Issuer Credit Rating to “bb+” from “bb” and affirmed the Financial Strength Rating of B (Fair) of Discovery Insurance Company (Discovery) (Kinston, NC). The outlook for these Credit Ratings (ratings) remains stable. The ratings reflect Discovery’s balance sheet strength, which A.M. Best categorizes as adequate, as well as its adequate operating performance, limited business profile and marginal enterprise risk management (ERM)