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
en 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.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Intoxicación Alimentaria por Salmonella
/
Infecciones por Salmonella
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Salmonella typhimurium
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Brotes de Enfermedades
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Periodo de Incubación de Enfermedades Infecciosas
/
Aeropuertos
Tipo de estudio:
Prognostic_studies
Límite:
Adolescent
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Adult
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Child
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Humans
/
Middle aged
País/Región como asunto:
Europa
Idioma:
En
Revista:
Euro Surveill
Asunto de la revista:
DOENCAS TRANSMISSIVEIS
Año:
2019
Tipo del documento:
Article
País de afiliación:
Noruega