LYZ and selective IgA deficiency disease: Patıroğlu and Kondolot[3] studied the administration of an oral lozenge containing 14 mg of colostrum and 2.2 mg of lysozyme or a placebo lozenge 3 times per day for 1 week in 31 children aged 5 to 16 years with known IgA deficiency and clinical signs of URTI.