X0306 4/A 2013-02-25 2013-02-27 0 0000353569 QUIDEL CORP /DE/ QDEL 0001222788 TAMERIUS JOHN 10165 MCKELLAR COURT SAN DIEGO CA 92121 0 1 0 0 SVP - Clinical/Reg Affairs Non-Qualified Stock Option 22.21 2013-02-25 4 A 0 19736 0.00 A 2023-02-25 Common Stock 19736 19736 D Restricted Stock Units 2013-02-25 4 A 0 900 0.00 A Common Stock 900 900 D 9,868 shares will vest on the second anniversary date of the grant date, February 25, 2015. 4,934 shares will vest on the third anniversary date of the grant date, February 25, 2016. 4,934 shares will vest on the fourth anniversary date of the grant date, February 25, 2017. Each restricted stock unit represents the right to receive one share of Quidel Corporation common stock. 450 shares will vest on the second anniversary date of the grant date, February 25, 2015. 225 shares will vest on the third anniversary date of the grant date, February 25, 2016. 225 shares will vest on the fourth anniversary date of the grant date, February 25, 2017. This amended Form 4 is being filed to correct the number of derivative securities acquired by the reporting person, the related amount of securities underlying the derivative securities, and the amounts that vest on the respective vesting dates. Robert J. Bujarski, attorney-in-fact for John Tamerius 2013-03-27