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Volume 7, Number 1—February 2001

Research

Gastroenteritis in Sentinel General Practices, the Netherlands

Matty A.S. de Wit*Comments to Author , Marion P.G. Koopmans*, Laetitia M. Kortbeek*, Nan J. van Leeuwen*, AAD I.M. Bartelds†, and Yvonne T.H.P. van Duynhoven*
Author affiliations: *National Institute of Public Health and the Environment, Bilthoven, The Netherlands; †Netherlands Institute of Primary Health Care, Utrecht, the Netherlands

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Table 4

Microorganisms detected in patients and controls

Patients (N=857) Controls (N=574)
No. % No. %
Salmonella spp. 33 3.9 1 0.2
S. Enteritidis 12 1.4 0 0.0
S. Typhimurium 11 1.3 1 0.2
other Salmonellaea 9 1.1 0 0.0
Campylobacter spp. 89 10.5 3 0.5
C. jejuni 77 9 3 0.5
C. coli 7 0.8 0 0.0
other species 5 0.6 0 0.0
Yersinia spp. 6 0.7 6 1.1
Y. enterocoliticab 5 0.6 5 0.9
Y. frederikseniic 1 0.1 1 0.2
Shigella spp. 1 0.1 0 0.0
S. flexneri 1 0.1 0 0.0
VTECd 4 0.5 3 0.6
Rotavirus 45 5.3 8 1.4
Adenovirus 19 2.2 2 0.4
Astrovirus 13 1.5 2 0.4
Norwalk-like viruses 43 5.0 6 1.1
Sapporo-like virusese 5 2.1 1 0.6
Giardia lamblia 46 5.4 19 3.3
Entamoeba histolytica/dispar 9 1.1 4 0.7
Cryptosporidium 18 2.1 1 0.2
Cyclospora 1 0.1 1 0.2
(Possibly) nonpathogenic microorganisms
Dientamoeba fragilis 88 10.3 84 14.6
Blastocystis hominis 185 21.7 172 30.0
Endolimax nana 14 1.6 14 2.4
Enteromonas hominis 2 0.2 1 0.2
Chilomastix mesnili 1 0.1 0 0.0
Entamoeba hartmanni 0 0.0 2 0.4
Enterobius vermicularis 0 0.0 1 0.2
Iodamoeba butschlii 0 0.0 1 0.2

aS. Heidelberg, S. Thompson, S. Kottbus, S. Montevideo, S. Manhattan, S. Anatum, S. Arizona, Salmonella group B (not fully typeable).
bSerotypes of Y. enterocolitica in patients: O6,31 (biotype 1a), O6,30; O6,30 (biotype 1A), one not typeable, one not typed. In controls: two O4 (biotype 1A); O65 (biotype 1A), O7,8 (biotype 1A); one not typeable.
cSerotypes of Y. frederiksenii: O16a,58 (case); O16AB,29 (control).
dVTEC=verocytotoxin-producing Escherichia coli: positive for eae gene and genes for either SLT1 or SLT2. VTEC serotypes in cases: O157 K-H-, O98 K-, O145 K-, one not typeable. In controls: O26, O145 K-, one not typeable
eSapporo-like viruses have only been tested for the last study year (May 98-Apr 99; 240 cases and 160 controls). Genotypes in cases: 4 Sapporo, 1 London, genotype in control: Sapporo.

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