CHICAGO — As nonprofit hospitals in the Twin Cities brace for a threatened nurses’ strike, Moody’s Investors Service warned yesterday that a prolonged walkout could pressure some hospital ratings if already-thin operating margins are hurt by increased costs for temporary nurses and a drop in patient revenue.

The warning came in Moody’s weekly credit outlook and it follows the Friday filing of a 10-day notice by the Minnesota Nurses Association that it will strike as soon as July 6 if contract negotiations fail. Settlement talks resume today to avert what would be the largest nursing strike ever in the U.S.

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