---
kind: "section"
citation: "21 C.F.R. § 660.44"
title: "21"
number: "660.44"
heading: "Specificity."
url: "https://uscodex.org/cfr/21/660.44"
---

# §660.44. Specificity.


Each filling of the product shall be specific for Hepatitis B Surface Antigen as determined by specificity tests found acceptable to the Director, Center for Biologics Evaluation and Research.


## Notes

### Amendments

[44 FR 36382, June 22, 1979, as amended at 49 FR 23834, June 8, 1984; 55 FR 11013, Mar. 26, 1990]

### Source

Source: 44 FR 36382, June 22, 1979, unless otherwise noted.

### Authority

Authority: 21 U.S.C. 321, 331, 351, 352, 353, 355, 360, 360c, 360d, 360h, 360i, 371, 372; 42 U.S.C. 216, 262, 263, 263a, 264.

### Amendments

[44 FR 36382, June 22, 1979, as amended at 49 FR 23834, June 8, 1984; 55 FR 11013, Mar. 26, 1990]