NY -- Standard&Poor's CreditWire 4/6/98 – Standard&Poor's today assigned is single-`A'-plus rating to Orange County, Fla.'s $65 million sales tax revenue bonds series 1998 dated April 1, 1998 due Jan. 1, 1999-2028. The bonds are expected to sell April 21, 1998. Standard&Poor's affirmed its single-`A'-plus rating on the county's $74.65 million sales tax revenue bonds series 1993A&B. Orange County's sales tax rating reflects potential future debt issuance secured by sales tax revenues to fund the county's capital improvement program, and the ability to issue variable-rate debt, which could be a concern given the fixed rate nature of this tax. These risks are substantially mitigated by the following strengths: -- Excellent growth in the county's