NEW YORK (Standard&Poor's) Jan. 6, 2010--Standard&Poor's Ratings Services raised the short-term component of the dual rating on Mayo Clinic, Minn.'s series 2000A bonds to 'A-1+' from 'A-1'. The long-term component of the rating remains 'AA-'. The upgrade of the short-term component of the rating reflects a substitution from a Morgan Stanley standby bond purchase agreement to self-liquidity supported by a $100 million line of credit from U.S. Bank N.A. The 'AA-' long-term component of the rating reflects the long-term credit strength of the Mayo Clinic while the 'A-1+' short-term component reflects the ability of Mayo Clinic to fund, from its own liquidity, any bonds that have been tendered, but not remarketed. Mayo Clinic demonstrates ample and