NY -- Standard&Poor's CreditWire 7/16/98 –- Standard&Poor's today assigned its single-'A' rating to New Jersey Health Care Facilities Financing Authority's $54.81 million revenue bonds series 1998 due July 1, 2025, issued for JFK Health Systems The bonds are scheduled to sell July 24, 1998. At the same time, Standard&Poor's lowered its rating on the authority's (Intercare Health System-John F. Kennedy Medical Center) $54.8 million revenue bonds issued for JFK Health Systems to single-'A' from single-'A'-plus. The rating reflects: -- The systems' revenue diversity, -- Anticipated benefits from merger with a competitor, and -- Good finances. The downgrade is due to reduced profitability and expectations of financial support outside the system. JFK Health Systems' business