On January 22, 2022, Charles P. Slacik informed the board of directors (the “Board”) of Quidel Corporation of his intent to retire from the Board, effective as of the next meeting of the Company's stockholders for the election of directors (the “Stockholders' Meeting”). Mr. Slacik's decision was not the result of any dispute or disagreement with the Company. On January 25, 2022, Kathy P. Ordoñez informed the Board of her intent to retire from the Board, effective as of the next Stockholders' Meeting.

Ms. Ordoñez's decision was not the result of any dispute or disagreement with the Company.