Exhibit 15.1

LETTER OF ERNST & YOUNG LLP REGARDING UNAUDITED INTERIM FINANCIAL INFORMATION

Board of Directors and Shareholders

STERIS Corporation

We are aware of the incorporation by reference in the following Registration Statements and Post Effective Amendment and related Prospectuses of our report dated February 8, 2013 relating to the unaudited consolidated interim financial statements of STERIS Corporation and subsidiaries that are included in its Form 10-Q for the quarter ended December 31, 2012:

Registration Number	Description
333-32005	Form S-8 Registration Statement - STERIS Corporation 1997 Stock Option Plan
333-06529	Form S-3 Registration Statement - STERIS Corporation
333-01610	Post-effective Amendment to Form S-4 on Form S-8 - STERIS Corporation
33-55976	Form S-8 Registration Statement - STERIS Corporation 401(k) Plan
333-09733	Form S-8 Registration Statement - STERIS Corporation 401(k) Plan
333-101308	Form S-8 Registration Statement - STERIS Corporation 2002 Stock Option Plan
333-137167	Form S-8 Registration Statement - STERIS Corporation Deferred Compensation Plan
333-136239	Form S-8 Registration Statement - STERIS Corporation 2006 Long-Term Equity Incentive Plan
333-170884	Form S-8 Registration Statement - STERIS Corporation 401(k) Plan
333-176167	Form S-8 Registration Statement - STERIS Corporation 2006 Long-Term Equity Incentive Plan (as Amended and Restated Effective July 28, 2011)

/s/    Ernst & Young LLP

Cleveland, Ohio

February 8, 2013