SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549


SCHEDULE 13G

Under the Securities Exchange Act of 1934
(Amendment No. )*

Quidel Corporation
(Name of Issuer)

Common Stock, par value $0.001 per share
(Title of Class of Securities)

74838J101
(CUSIP Number)

April 28, 2022
(Date of Event Which Requires Filing of this Statement)


Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

¨	Rule 13d-1(b)
ý	Rule 13d-1(c)
¨	Rule 13d-1(d)

(Page 1 of 8 Pages)

______________________________

*The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

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1	NAME OF REPORTING PERSON Senvest Management, LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) ¨ (b) ¨
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	5	SOLE VOTING POWER 0
	6	SHARED VOTING POWER 2,161,521
	7	SOLE DISPOSITIVE POWER 0
	8	SHARED DISPOSITIVE POWER 2,161,521
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,161,521
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES			¨
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.17%
12	TYPE OF REPORTING PERSON OO, IA

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1	NAME OF REPORTING PERSON Richard Mashaal
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) ¨ (b) ¨
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION Canada
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	5	SOLE VOTING POWER 0
	6	SHARED VOTING POWER 2,161,521
	7	SOLE DISPOSITIVE POWER 0
	8	SHARED DISPOSITIVE POWER 2,161,521
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,161,521
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES			¨
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.17%
12	TYPE OF REPORTING PERSON IN, HC

CUSIP No. 74838J101

13G

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Item 1(a).	Name of Issuer.

	Quidel Corporation (the "Issuer")

Item 1(b).	Address of Issuer's Principal Executive Offices.

	9975 Summers Ridge Road, San Diego, California 92121

Item 2(a).	Name of Person Filing.

	This statement is filed by Senvest Management, LLC and Richard Mashaal.

	The reported securities are held in the account of Senvest Master Fund, LP (the "Investment Vehicle").

	Senvest Management, LLC may be deemed to beneficially own the securities held by the Investment Vehicle by virtue of Senvest Management, LLC's position as investment manager of the Investment Vehicle. Mr. Mashaal may be deemed to beneficially own the securities held by the Investment Vehicle by virtue of Mr. Mashaal's status as the managing member of Senvest Management, LLC. None of the foregoing should be construed in and of itself as an admission by any Reporting Person as to beneficial ownership of the securities reported herein.

Item 2(b).	Address of Principal Business Office.
	Senvest Management, LLC 540 Madison Avenue, 32^nd Floor New York, New York 10022

	Richard Mashaal c/o Senvest Management, LLC 540 Madison Avenue, 32^nd Floor New York, New York 10022

Item 2(c).	Place of Organization.

	Senvest Management, LLC – Delaware

	Richard Mashaal – Canada

Item 2(d).	Title of Class of Securities.

	Common Stock, par value $0.001 per share

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Item 2(e).	CUSIP Number.

	74838J101

Item 3.

If this Statement is Filed Pursuant to §§ 240.13d-1(b) or 240.13d-2(b), or (c), check whether the Person Filing is a:

(a)	¨	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	¨	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	¨	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	¨	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	¨	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	¨	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	¨	A parent holding company or control person in accordance with §240.13d-1(b)(1)(ii)(G);
(h)	¨	A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C.1813);
(i)	¨	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	¨	A non-U.S. institution in accordance with §240.13d-1(b)(1)(ii)(J);
(k)	¨	Group, in accordance with §240.13d-1(b)(1)(ii)(K).

	If filing as a non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J), please
	specify the type of institution:

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Item 4.	Ownership.

	The information required by Items 4(a) – (c) is set forth in Rows (5) – (11) of the cover page for each Reporting Person hereto and is incorporated herein by reference for each such Reporting Person. The percentages set forth in this Schedule 13G are calculated based upon an aggregate of 41,848,256 shares of Common Stock outstanding as of April 28, 2022, as reported in the Issuer's Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2022 filed with the Securities and Exchange Commission on May 5, 2022.

Item 5.	Ownership of Five Percent or Less of a Class.

	Not applicable.

Item 6.	Ownership of More Than Five Percent on Behalf of Another Person.

	The Investment Vehicle has the right to receive and the power to direct the receipt of dividends from, and the proceeds from the sale of, more than 5% of the shares of Common Stock.

Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.

	Not applicable.

Item 8.	Identification and Classification of Members of the Group.

	Not applicable.

Item 9.	Notice of Dissolution of Group.

	Not applicable.

Item 10.	Certification.

	By signing below each Reporting Person certifies that, to the best of his or its knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

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SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, each of the undersigned certifies that the information set forth in this statement is true, complete and correct.

Date: May 5, 2022
	SENVEST MANAGEMENT, LLC

	By:	/s/ Bobby Trahanas
	Name: Bobby Trahanas
	Title: Chief Compliance Officer




	/s/ Richard Mashaal
	RICHARD MASHAAL

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Exhibit A

JOINT FILING AGREEMENT

The undersigned acknowledge and agree that the foregoing statement on Schedule 13G is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13G shall be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him or it contained herein and therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that he or it knows or has reason to believe that such information is inaccurate.

Date: May 5, 2022
	SENVEST MANAGEMENT, LLC

	By:	/s/ Bobby Trahanas
	Name: Bobby Trahanas
	Title: Chief Compliance Officer




	/s/ Richard Mashaal
	RICHARD MASHAAL

QUIDEL CORP /DE/ SC 13G