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Journal of Clinical Microbiology, March 2000, p. 1058-1062, Vol. 38, No. 3
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Epidemiology of Astrovirus Infection in Young
Children Hospitalized with Acute Gastroenteritis in Melbourne,
Australia, over a Period of Four Consecutive Years, 1995 to
1998
Huseyin
Mustafa,
Enzo A.
Palombo,* and
Ruth F.
Bishop
Department of Gastroenterology and Clinical
Nutrition, Royal Children's Hospital, Parkville, Victoria 3052, Australia
Received 27 August 1999/Returned for modification 17 November
1999/Accepted 15 December 1999
The incidence of astrovirus infection in children less than 5 years
of age hospitalized with acute gastroenteritis in Melbourne, Australia,
from 1995 to 1998 was determined. Astrovirus was detected in 40 of 449 specimens tested by Northern hybridization, and astrovirus infection
was confirmed by reverse transcription-PCR with or without culture in
CaCO-2 cells. This represented 3.0% (40 of 1,327) of all children
tested for enteric pathogens, including viral, bacterial, and parasitic
pathogens, over the survey period. The incidences of astrovirus
infection in each year were 4.4% (1995), 2.2% (1996), 3.9% (1997),
and 1.4% (1998). In 1995 and 1997, the incidences of astrovirus
infection were greater than the incidence of infection with all
individual bacterial pathogens and were either greater than or equal to
the incidence of adenovirus infection. Astrovirus exhibited an unusual
biennial winter peak of incidence that correlated with a greater
incidence of serotype 1 virus and an increased rate of hospitalization
of children aged 6 to 12 months. Uncommon (serotype 2 and 4) and rare
(serotype 8) serotypes were detected during the survey period. Genetic
analysis of ORF2 (which encodes the astrovirus capsid precursor) of
Melbourne isolates showed nucleotide sequence variation from year to
year. This was not accompanied by significant amino acid substitutions.
However, geographical variation was apparent by comparison of Melbourne astrovirus isolates with prototype strains identified in the United Kingdom.
*
Corresponding author. Mailing address: Department of
Gastroenterology and Clinical Nutrition, Royal Children's Hospital,
Flemington Rd., Parkville, Victoria 3052, Australia. Phone: 61 3 9345 5060. Fax: 61 3 9345 6240. E-mail:
palomboe{at}cryptic.rch.unimelb.edu.au.
Journal of Clinical Microbiology, March 2000, p. 1058-1062, Vol. 38, No. 3
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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