NEW YORK -- Standard&Poor's CreditWire 10/2/98 -- Standard&Poor's today affirmed its double-'B' rating on the United Mexican States' US$52 billion of long-term senior unsecured foreign currency debt and its triple-'B'-plus/'A-2' ratings on Mexico's Ps280 billion of long- and short-term peso-denominated debt. Additionally, Standard&Poor's affirmed its double-'B' long-term and single-'B' short-term foreign currency sovereign credit ratings and its triple-'B'-plus long-term local currency sovereign credit rating on Mexico. The rating outlook has been revised to stable from positive. The stable outlook reflects Standard&Poor's expectation that Mexico's comparatively comfortable fiscal position and prudent external liability structure will support stable credit standing even in a reasonably adverse external environment. High domestic interest rates and the continuing