21 U.S.C. § 392

(a) Law determinative of exemption Meats and meat food products shall be exempt from the provisions of this chapter to the extent of the application or the extension thereto of the Meat Inspection Act, approved March 4, 1907 , as amended [ 21 U.S.C. 601 et seq.]. (b) Laws unaffected Nothing contained in this chapter shall be construed as in any way affecting, modifying, repealing, or superseding the provisions of section 351 of Public Health Service Act [ 42 U.S.C. 262 ] (relating to viruses, serums, toxins, and analogous products applicable to man); the virus, serum, toxin, and analogous products provisions, applicable to domestic animals, of the Act of Congress approved March 4, 1913 ( 37 Stat. 832–833 ) [ 21 U.S.C. 151 et seq.]; the Filled Cheese Act of June 6, 1896 (U.S.C., 1934 ed., title 26, ch. 10), the Filled Milk Act of March 4, 1923 [ 21 U.S.C. 61 et seq.]; or the Import Milk Act of February 15, 1927 [ 21 U.S.C. 141 et seq.].