Increasing incubation periods during a prolonged monophasic Salmonella Typhimurium outbreak with environmental contamination of a commercial kitchen at Oslo Airport, Norway, 2017.
Euro Surveill
; 24(34)2019 Aug.
Article
em En
| MEDLINE
| ID: mdl-31456559
ABSTRACT
In September 2017, a cluster of monophasic Salmonella Typhimurium isolates was identified at the National Reference Laboratory for Enteropathogenic Bacteria in Norway. We investigated the cluster to identify the source and implement control measures. We defined a case as a person with laboratory-confirmed salmonellosis with the outbreak strain multiple locus variable-number tandem repeat analysis type. We conducted descriptive epidemiological and environmental investigations and performed whole genome sequencing (WGS) with core and accessory genome multilocus sequence typing of all isolates from cases or the environment connected with this outbreak. We identified 21 cases, residing in 10 geographically dispersed counties, all of whom had consumed food or drinks from a café at Oslo Airport. Case distribution by date of symptom onset suggested that a point source was introduced in mid-August followed by continued environmental contamination. The incubation periods ranged 0-16 days and increased as the outbreak progressed, likely due to increasingly low-dose exposure as control measures were implemented. WGS confirmed an identical cluster type-944 in all cases and six environmental specimens from the café. Control measures, including temporary closure and kitchen refurbishment, failed to eliminate the environmental source. We recommend strengthened hygiene measures for established environmental contamination during an outbreak.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Intoxicação Alimentar por Salmonella
/
Infecções por Salmonella
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Salmonella typhimurium
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Surtos de Doenças
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Período de Incubação de Doenças Infecciosas
/
Aeroportos
Tipo de estudo:
Prognostic_studies
Limite:
Adolescent
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Adult
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Child
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Humans
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Middle aged
País/Região como assunto:
Europa
Idioma:
En
Revista:
Euro Surveill
Assunto da revista:
DOENCAS TRANSMISSIVEIS
Ano de publicação:
2019
Tipo de documento:
Article
País de afiliação:
Noruega