Exhibit 24.2

I, Katie E. Fedosz, Senior Assistant Secretary of Merck & Co., Inc. (the “Company”), a corporation duly organized and existing under the laws of the State of New Jersey, do hereby certify that the following is a true copy of a resolution adopted at a meeting of the Board of Directors of said Company on February 23, 2016 in accordance with the provisions of the By-Laws of said Company:

“Special Resolution No. – 2016

RESOLVED, that the proposed form of the Annual Report on Form 10-K of the Company for the fiscal year ended December 31, 2015 attached hereto is hereby approved with such changes as the proper officers of the Company, with the advice of counsel, deem appropriate; and

FURTHER RESOLVED, that each officer and director who may be required to execute the aforesaid Annual Report on Form 10-K or any amendments thereto (whether on behalf of the Company or as an officer or director thereof, or by attesting the seal of the Company, or otherwise) is hereby authorized to execute a power of attorney appointing Michael J. Holston as his/her true and lawful attorney to execute in his/her name, place and stead (in any such capacity) such Annual Report on Form 10‑K and any and all amendments thereto and any and all exhibits and other documents necessary or incidental in connection therewith and to file the same with the Securities and Exchange Commission, the attorney to have power to act, and to have full power and authority to do and perform in the name and on behalf of each of said officers and directors, or both, as the case may be, every act whatsoever necessary or advisable to be done in the premises as fully and to all intents and purposes as any such officer or director might or could do in person.”

IN WITNESS WHEREOF, I have hereunto subscribed my signature and affixed the seal of the Company this 26^th day of February 2016.

[Corporate Seal]	/s/ Katie E. Fedosz
	Katie E. Fedosz Senior Assistant Secretary