Incidence of Norwalk virus infections during a prospective epidemiological study of drinking water-related gastrointestinal illness.

Abstract:

:To determine the seroprevalence of Norwalk virus and whether Norwalk virus contributed to an observed increase in illness in tap water drinkers participating in a prospective epidemiological study, sera collected during the study were examined for changes in Norwalk virus antibody titer, using a specific enzyme immunoassay. Antibodies to Norwalk virus were measured in sera collected in March, June and September 1988 and in June 1989, and antibodies were found in 79% of the individuals. Seroprevalence increased with age, being 55% (ages 9-19), 79% (20-39), 87% (40-49), 84% (50-59), and 100% (60 and older). Norwalk infections occurred in 33% of the individuals during the course of the study. The highest rate of infection (expressed as a monthly rate) was observed during the summer of 1988. These results confirm that a large number of infections owing to Norwalk viruses occur throughout the year. A previous seroconversion or a high serum titer were not always protective. Finally, there was no detectable difference in infection rate between consumers of tap water and consumers of water treated by reverse-osmosis units, suggesting that Norwalk virus infections were not responsible for the excess of gastrointestinal illness observed in tap water drinkers during this epidemiological study.

journal_name

Can J Microbiol

authors

Payment P,Franco E,Fout GS

doi

10.1139/m94-128

subject

Has Abstract

pub_date

1994-10-01 00:00:00

pages

805-9

issue

10

eissn

0008-4166

issn

1480-3275

journal_volume

40

pub_type

临床试验,杂志文章,随机对照试验
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