(a) Identification. Norovirus serological reagents are devices that consist of antigens and antisera used in serological tests to detect the presence of norovirus antigens in fecal samples. These devices aid in the diagnosis of norovirus infection in the setting of an individual patient with symptoms of acute gastroenteritis when the individual patient is epidemiologically linked to other patients with symptoms of acute gastroenteritis and/or aid in the identification of norovirus as the etiology of an outbreak of acute gastroenteritis in the setting of epidemiologically linked patients with symptoms of acute gastroenteritis.
(b) Classification. Class II (special controls). The special control is FDA's guidance document entitled ``Class II Special Controls Guidance Document: Norovirus Serological Reagents.'' See Sec. 866.1(e) for the availability of this guidance document. [76 FR 14274, Mar. 9, 2012]