San Diego-based Quidel , a developer of diagnostic tests for the healthcare industry, said Tuesday that it has cut approximately 10 percent of its work force, or 31 employees, in a corporate restructuring. The firm also said that its Chief Technology Officer, Thomas Foley, will retire, although the firm said that the move was unrelated to the restructuring. ...Tags: According to Quidel, it made the cuts in order to "gain operational efficiences and reduce costs." Quidel disclosed that the cuts included two senior-level positions, an elimination of its annual