Form 3 - Initial statement of beneficial ownership of securities

POWER OF ATTORNEY

Know all by these present that the undersigned hereby constitutes and appoints each of Michelle A. Hodges, Joseph M. Busky, Jennifer Ahn, Phillip S. Askim and Euna Greene signing singly and not jointly, the undersigned’s true and lawful attorneys-in-fact and agents to:

(1) execute for and on behalf of the undersigned, in the undersigned’s capacity as an officer, director or beneficial owner of more than 10% of a registered class of securities of QuidelOrtho Corporation (the “Company”), (a) any and all Forms 3, 4, and 5 (including any amendments thereto) required to be filed under Section 16(a) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and the rules thereunder and (b) a Form ID, Uniform Application for Access Codes to File on EDGAR, including Update Passphrase Confirmation;

(2) do and perform any and all acts for and on behalf of the undersigned that may be necessary or desirable to complete and execute any and all such Forms 3, 4, and/or 5 and timely file such forms with the United States Securities and Exchange Commission and any stock exchange or similar authority, including without limitation, obtaining and updating EDGAR Access Codes and preparing Form ID forms; and

(3) take any other action of any type whatsoever in connection with the foregoing which, in the opinion of such attorney-in-fact, may be of benefit to, in the best interest of, or legally required by, the undersigned, it being understood that the documents executed by such attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may approve in such attorney-in-fact’s discretion.

The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact’s substitute or substitutes, shall lawfully do or cause to be done by virtue of this Power of Attorney and the rights and powers herein granted. The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming, nor is the Company assuming, any of the undersigned’s responsibilities to comply with Section 16 of the Exchange Act.

This Power of Attorney shall remain in full force and effect until the earliest to occur of (a) the undersigned is no longer required to file Forms 3, 4 and 5 with respect to the undersigned’s holdings of and transactions in securities issued by the Company, or (b) revocation by the undersigned in a signed writing delivered to the foregoing attorneys-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 16th day of October 2024.

/s/ Jonathan P. Siegrist

Jonathan P. Siegrist

 

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