X0306 4 2012-11-27 0 0000353569 QUIDEL CORP /DE/ QDEL 0001298084 Brown Thomas D 29890 TANYA TRAIL LIBERTYVILLE IL 60048 1 0 0 0 Common Stock 2012-11-27 4 M 0 4000 9.93 A 22897 D Common Stock 2012-11-27 4 S 0 4000 17.3105 D 18897 D Common Stock 2012-11-29 4 M 0 5331 9.93 A 24228 D Common Stock 2012-11-29 4 S 0 5331 17.3107 D 18897 D Non-Qualified Stock Option 9.93 2012-11-27 4 D 0 4000 0.00 D 2007-05-17 2016-05-16 Common Stock 4000 5331 D Non-Qualified Stock Option 9.93 2012-11-29 4 D 0 5331 0.00 D 2007-05-17 2016-05-16 Common Stock 5331 0 D Reflects vesting of 2,469 prior restricted stock units, which were not previously reported on Table I on a Form 4 filed on May 17, 2012. The weighted average sale price for these transactions was $17.31054 per share, with a range of $17.25 to $17.39 per share. 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. The weighted average sale price for these transactions was $17.31074 per share, with a range of $17.29 to $17.37 per share. 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. Robert J. Bujarski, attorney-in-fact for Thomas D. Brown 2012-11-29