QDEL QuidelOrtho Corporation

FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES                                                                                   
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940                       

1. Name and Address of Reporting Person * Ferenczy William J.	2. Issuer Name and Ticker or Trading Symbol QUIDEL CORP /DE/ [ QDEL ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director                    _____ 10% Owner __X__ Officer (give title below)    _____ Other (specify below) SVP, Cardio/Metabolic Unit
(Last)          (First)          (Middle) 9975 SUMMERS RIDGE ROAD	3. Date of Earliest Transaction (MM/DD/YYYY) 3/17/2021
(Street) SAN DIEGO, CA 92121 (City)        (State)        (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)	6. Individual or Joint/Group Filing (Check Applicable Line) _X _ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	3. Trans. Code (Instr. 8)		4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	3/17/2021		M		691	A	$23.41	8596 (1)	D
Common Stock	3/17/2021		M		3910	A	$15.40	12506	D
Common Stock	3/17/2021		S		4601	D	$136.0654 (2)	7905	D
Common Stock	3/17/2021		S		2799	D	$136.0488 (3)	5106	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. Trans. Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Non-Qualified Stock Options	$23.41	3/17/2021		M			691	(4)	2/5/2025	Common Stock	691	$0.00	1263	D
Non-Qualified Stock Options	$15.40	3/17/2021		M			3910	(5)	2/10/2026	Common Stock	3910	$0.00	0	D

Explanation of Responses:
(1)	The amount of securities beneficially owned includes 595 shares not previously reported due to a clerical error.
(2)	The weighted average sale price for these transactions was $136.0654 per share, with a range of $134.11 to $138.52. Upon request, the Reporting Person hereby undertakes to provide to staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder, the full information regarding the number of shares sold at each separate price.
(3)	The weighted average sale price for these transactions was $136.0488 per share, with a range of $134.11 to $138.51. Upon request, the Reporting Person hereby undertakes to provide to staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder, the full information regarding the number of shares sold at each separate price.
(4)	977 shares vested on 02/05/2018 and 977 shares vested on 02/05/2019.
(5)	1,956 shares vested on 02/10/2018; 977 shares vested on 02/10/2019; and 977 shares vested on 02/10/2020.

Remarks: All transactions reported herein were effected pursuant to a pre-established 10b5-1 trading plan.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Ferenczy William J. 9975 SUMMERS RIDGE ROAD SAN DIEGO, CA 92121			SVP, Cardio/Metabolic Unit

Signatures
Phillip S. Askim, attorney-in-fact for William J. Ferenczy		3/19/2021
**Signature of Reporting Person		Date