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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 3

Etiologies of verified, probable, and possible foodborne incidents (single cases and outbreaks)

Etiologic agent No. single cases No. outbreaksa (no. cases) Total no. of single and
outbreak-associated
cases, by agent
Verified
Bacillus cereus 1 1 (3) 4
Calicivirus 0 5 (23) 23
Campylobacter spp. 0 2 (6) 6
Histamine 1 1 (2) 3
Staphylococcus aureus 1 3 (97) 98
Multiple agentsb 0 1 (2) 2
Subtotal 3 13 (133) 136
Probable
B. cereus 1 0 (0) 1
Calicivirus 0 2 (4) 4
Campylobacter spp. 3 0 (0) 3
EHECc 0 1 (2) 2
EPECc 0 1 (2) 2
S. aureus 1 0 (0) 1
Unknown 0 51 (148) 148
Subtotal 5 55 (156) 161
Possible
Astroviruses 2 0 (0) 2
Caliciviruses 12 1 (2) 14
Campylobacter spp. 7 0 (0) 7
EHEC 2 0 (0) 2
EIECc 1 0 (0) 1
Rotavirus 2 0 (0) 2
Salmonella Enteritidis 1 0 (0) 1
Multiple agentsd 1 1 (2) 3
Unknown 147 15 (39) 186
Subtotal 175 17 (43) 218




Total 183 85 (332) 515

aAn incident in which two or more persons experienced a similar illness after ingestion of a common food, and epidemiologic analysis implicated food as the source of the illness.
bAn outbreak in which caliciviruses were detected in feces samples, and high levels of B. cereus and S. aureus were detected in suspected food samples.
cEHEC = enterohaemorrhagic Escherichia coli; EPEC = enteropatogenic E. coli; EIEC = enteroinvasive E. coli.
dOne incident in which rotaviruses, caliciviruses, and EHEC were detected in the feces sample from a single case, and one outbreak in which EHEC and caliciviruses were detected in the same feces sample.

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