---
kind: "section"
citation: "21 C.F.R. § 866.3900"
title: "21"
number: "866.3900"
heading: "Varicella-zoster virus serological reagents."
url: "https://uscodex.org/cfr/21/866.3900"
---

# §866.3900. Varicella-zoster virus serological reagents.

- (a) **Identification.** Varicella-zoster virus serological reagents are devices that consist of antigens and antisera used in serological tests to identify antibodies to varicella-zoster in serum. The identification aids in the diagnosis of diseases caused by varicella-zoster viruses and provides epidemiological information on these diseases. Varicella (chicken pox) is a mild, highly infectious disease, chiefly of children. Zoster (shingles) is the recurrent form of the disease, occurring in adults who were previously infected with varicella-zoster viruses. Zoster is the response (characterized by a rash) of the partially immune host to a reactivation of varicella viruses present in latent form in the patient's body.
- (b) **Classification.** Class II (performance standards).

## Notes

### Authority

Authority: 21 U.S.C. 351, 360, 360c, 360e, 360j, 360 l, 371.

### Source

Source: 47 FR 50823, Nov. 9, 1982, unless otherwise noted.