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Volume 7, Number 7—June 2001

Research

A One-Year Study of Foodborne Illnesses in the Municipality of Uppsala, Sweden

Roland Lindqvist*Comments to Author , Yvonne Andersson†, Johan Lindbäck†, Maria Wegscheider‡, Yvonne Eriksson‡, Lasse Tideström§, Angela Lagerqvist-Widh¶, Kjell-Olof Hedlund†, Sven Löfdahl†, Lennart Svensson†, and Anna Norinder#
Author affiliations: *National Food Administration, Uppsala, Sweden; †Swedish Institute for Infectious Diseases Control, Solna, Sweden; ‡The Municipality of Uppsala, Uppsala, Sweden; §The Regional Infectious Disease Unit, Uppsala, Sweden; ¶University Hospital, Uppsala, Sweden; #The Swedish Institute for Health Economics, Lund, Sweden

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Table 2

Disease agents detected in feces and food samples and implicateda as etiologic agents in the investigated illnesses

Detected in
(no. samples/incidents)
Implicated in (no.)
Feces Food Incidents Illnesses
Bacteria
Bacillus cereus nab 12/9 3 5
Campylobacter spp. 12/12 0 12 16
EHECb 4/4c 5/5d 3 4
EIECb 1/1 na 1 1
EPECb 1/11 na 1 2
ETECb 1/1c na 0 0
Salmonella spp.e 1/1 0 1 1
Staphylococcus aureus na 10/9 5 99f
Total 20/20 25/21c 26 128
Viruses
Astroviruses 2/2 na 2 2
Caliciviruses 25/23c na 20 41
Rotaviruses 3/3c na 2 2
Total 29/27c 24 45
Histamine na na 2 3
Several agents c 3 5
Unknown 213 334
Negative 76/56 133/45





Total agents 123/101g 158/66 268 515

aThe agent was implicated as a cause of an illness incident on the basis of laboratory evidence, the interview, and assuming foodborne transmission.
bna = not analyzed; EHEC = enterohaemorrhagic Escherichia coli; EIEC = enteroinvasive E. coli; EPEC = enteropathogenic E. coli; ETEC = enterotoxigenic E. coli.
cIn two of the incidents, two (caliciviruses and EHEC) and three agents (calicivirus, ETEC, and rotaviruses), respectively, were detected in feces samples, and in two other incidents, two agents (E. coli and B. cereus, and S. aureus and B. cereus, respectively) were detected in food samples.
dRefers ti generic E. coli. No further characterization was done.
eSalmonella Enteritidis (phage type 21).
fIn the largest incident (93 cases), disease agents other than S. aureus may have been involved since atypically long incubation times were recorded for some of the cases.
gSum minus negative does not equal the number of positive samples since two or more agents were detected in some samples. See footnote c.

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