How many times did Keven Kuhn receive DTaP immunization?
DTaP immunization refers to immunizations where DESCRIPTION = 'DTaP';
SELECT COUNT(T2.CODE) FROM patients AS T1 INNER JOIN immunizations AS T2 ON T1.patient = T2.PATIENT WHERE T1.first = 'Keven' AND T1.last = 'Kuhn' AND T2.DESCRIPTION = 'DTaP'