MEXICO CITY: AM Best has affirmed the Financial Strength Rating of A- (Excellent), the Long-Term Issuer Credit Rating of “a-”, and the Mexico National Scale Rating (NSR) of “aaa.MX” of General de Seguros, S.A.B. (Genseg). The outlook of these Credit Ratings (ratings) is stable. The ratings reflect Genseg’s balance sheet strength, which AM Best categorizes…