Frequency of Preclumped Virus in Routine Fecal Specimens from Patients with Acute Nonbacterial Gastroenteritis

Overview

Journal J Clin Microbiol

Specialty Microbiology

Date 1981 May 1

PMID 6263948

Citations 18

Authors

H K Narang

A A Codd

Affiliations

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Abstract

A low-speed centrifugation technique for the preparation of grids after minimal purification of fecal extracts is described for examination of viruses by direct electron microscopy using negative staining. Results showed that adenovirus, astrovirus, rotavirus, and "small round" viruses were frequently shed into the gastrointestinal tract in clumps of variable size. Differential centrifugation study showed that a substantial proportion of the virus in the sample was lost in the initial pellet at the first step of clarification; this finding casts doubt on the validity of immune electron microscopy for direct typing of strains of these viruses from stools. In addition, particle counts based on conventional specimen processing are likely to grossly underestimate the true value.

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