Volume 7, Number 7—June 2001
Research
A One-Year Study of Foodborne Illnesses in the Municipality of Uppsala, Sweden
Roland Lindqvist*
, Yvonne Andersson†, Johan Lindbäck†, Maria Wegscheider‡, Yvonne Eriksson‡, Lasse Tideström§, Angela Lagerqvist-Widh¶, Kjell-Olof Hedlund†, Sven Löfdahl†, Lennart Svensson†, and Anna Norinder#
, Yvonne Andersson†, Johan Lindbäck†, Maria Wegscheider‡, Yvonne Eriksson‡, Lasse Tideström§, Angela Lagerqvist-Widh¶, Kjell-Olof Hedlund†, Sven Löfdahl†, Lennart Svensson†, and Anna Norinder#
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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