Ownership Submission
FORM 3
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  BORKAR RATAN S
2. Date of Event Requiring Statement (Month/Day/Year)
10/16/2017
3. Issuer Name and Ticker or Trading Symbol
QUIDEL CORP /DE/ [QDEL]
(Last)
(First)
(Middle)
12544 HIGH BLUFF DRIVE, SUITE 200
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
SVP, Intl Comm Operations
5. If Amendment, Date Original Filed(Month/Day/Year)
10/18/2017
(Street)

SAN DIEGO, CA 92130
6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)
2. Amount of Securities Beneficially Owned
(Instr. 4)
3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)
4. Nature of Indirect Beneficial Ownership
(Instr. 5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)
2. Date Exercisable and Expiration Date
(Month/Day/Year)
3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)
4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)
6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Non-Qualified Stock Options (Right to Buy) 01/18/2014 01/18/2020 Common Stock 3,169 $ 15.28 D  
Non-Qualified Stock Options (Right to Buy) 03/02/2015 03/02/2021 Common Stock 9,000 $ 12.63 D  
Non-Qualified Stock Options (Right to Buy) 03/02/2016 03/02/2022 Common Stock 25,223 $ 15.19 D  
Non-Qualified Stock Options (Right to Buy) 02/25/2017 02/25/2023 Common Stock 17,269 $ 22.21 D  
Non-Qualified Stock Options (Right to Buy)   (1) 02/24/2024 Common Stock 21,068 $ 27.57 D  
Non-Qualified Stock Options (Right to Buy)   (2) 02/05/2025 Common Stock 21,506 $ 23.41 D  
Non-Qualified Stock Options (Right to Buy)   (3) 02/10/2026 Common Stock 21,506 $ 15.4 D  
Non-Qualified Stock Options (Right to Buy)   (4) 02/15/2027 Common Stock 7,593 $ 21.08 D  
Restricted Stock Units 02/24/2018   (5) Common Stock 240 $ 0 (6) D  
Restricted Stock Units (Converted) 02/28/2014   (7) Common Stock 1,963 $ 0 (6) D  
Restricted Stock Units (Premium) 02/28/2015   (8) Common Stock 589 $ 0 (6) D  
Restricted Stock Units   (9)   (9) Common Stock 1,468 $ 0 (6) D  
Restricted Stock Units (Converted) 02/11/2015   (7) Common Stock 1,995 $ 0 (6) D  
Restricted Stock Units (Premium) 02/11/2016   (10) Common Stock 598 $ 0 (6) D  
Restricted Stock Units   (11)   (11) Common Stock 2,938 $ 0 (6) D  
Restricted Stock Units (Converted) 02/16/2016   (7) Common Stock 3,168 $ 0 (6) D  
Restricted Stock Units (Premium) 02/16/2017   (10) Common Stock 950 $ 0 (6) D  
Restricted Stock Units 09/19/2020   (12) Common Stock 2,500 $ 0 (6) D  
Restricted Stock Units 02/15/2021   (13) Common Stock 3,797 $ 0 (6) D  
Restricted Stock Units (Converted) 02/17/2017   (7) Common Stock 4,674 $ 0 (6) D  
Restricted Stock Units (Premium) 02/17/2018   (14) Common Stock 1,471 $ 0 (6) D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
BORKAR RATAN S
12544 HIGH BLUFF DRIVE
SUITE 200
SAN DIEGO, CA 92130
      SVP, Intl Comm Operations  

Signatures

Robert J. Bujarski, attorney-in-fact for Ratan S. Borkar 11/13/2017
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) 10,534 shares vested on 02/24/2016; 10,534 shares will vest on 02/24/2018.
(2) 10,754 shares vested on 02/05/2017; 5,376 shares will vest on 02/05/2018; and 5,376 shares will vest on 02/05/2019.
(3) 10,754 shares will vest on 02/10/2018; 5,376 shares will vest on 02/10/2019; and 5,376 shares will vest on 02/10/2020.
(4) 3,797 shares will vest on 02/15/2019; 1,898 shares will vest on 02/15/2020; and 1,898 shares will vest on 02/15/2021.
(5) Each restricted stock unit will vest on the fourth anniversary date of the grant date, 02/24/2018.
(6) Each restricted stock unit represents the right to receive one share of Quidel Corporation common stock.
(7) The restricted stock units were received in lieu of a percentage of the reporting person's annual cash bonus pursuant to the company's deferred bonus compensation plan.
(8) The restricted stock units vested on the first anniversary date of the grant date, 02/28/2015.
(9) 734 shares will vest on 02/15/2018; 734 shares will vest on 02/05/2019.
(10) The restricted stock units vested on the first anniversary date of the grant date, 02/16/2016.
(11) 1,469 restricted stock units will vest on 02/10/2018; 734 restricted stock units will vest on 02/10/2019; and 735 restricted stock units will vest on 02/10/2020.
(12) The restricted stock units will vest on the fourth anniversary date of the grant date, 09/19/2020.
(13) The restricted stock units will vest on the fourth anniversary date of the grant date, 02/17/2021.
(14) The restricted stock units will vest on the first anniversary date of the grant date, 02/17/2018.
 
Remarks:
This Form 3/A is being filed to include items on Table II that were inadvertently omitted from the reporting person's original Form 3.

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