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Two successive outbreaks of SRSV-associated gastroenteritis in South Africa

✍ Scribed by Dr. Maureen B. Taylor; Carmen I. Schildhauer; Simon Parker; Wilhelm O. K. Grabow; Xi Jiang; Mary K. Estes; W. David Cubitt

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
742 KB
Volume
41
Category
Article
ISSN
0146-6615

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✦ Synopsis

Abstract

Two successive outbreaks of gastroenteritis in South Africa were investigated to identify the aetiological agents. Some patients were involved in both outbreaks. Enteropathogenic bacteria or parasites were not evident in either outbreak. Small round structured viruses (SRSVs) were demonstrated in both outbreaks by direct electron microscopy. SRSV UK3/Hawaii virus was identified by immune electron microscopy as the causative agent in the first outbreak. Using new recombinant Norwalk virus (rNV) immunoassays for antibodies and antigen, Norwalk virus was implicated in the second outbreak. Preexisting antibodies to Norwalk virus were not protective and there was no cross protection between Hawaii and Norwalk viruses. There was no anamnestic response to Norwalk virus following the SRSV UK3/Hawaii outbreak although those affected had preexisting antibodies to Norwalk virus. To our knowledge, this is the first definitive diagnosis of SRSV‐associated gastroenteritis in South Africa.

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