RESUMEN
Sweden is investigating an outbreak of monophasic Salmonella Typhimurium. Eighty-two nationally-distributed cases have been confirmed, with date of symptom onset between 28 August and 29 October. Cases were 51 years of age on average (range: 0-89) and the majority of cases were female (62%). A case-control study was conducted and suggested small tomatoes as source of the outbreak (adjusted odds ratio (OR): 10.8, 95% confidence interval (CI): 4.15-112.68, p valueâ¯<â¯0.001), and a trace-back investigation led to a single, non-Swedish producer in Europe. Both the Salmonella strain and the source of the outbreak are rarely encountered in Europe. Results from investigation at the producer are pending.
Asunto(s)
Brotes de Enfermedades/estadística & datos numéricos , Heces/microbiología , Contaminación de Alimentos/estadística & datos numéricos , Intoxicación Alimentaria por Salmonella/epidemiología , Infecciones por Salmonella/diagnóstico , Salmonella typhimurium/aislamiento & purificación , Solanum lycopersicum/microbiología , Adolescente , Adulto , Anciano , Anciano de 80 o más Años , Estudios de Casos y Controles , Niño , Preescolar , Femenino , Humanos , Lactante , Recién Nacido , Masculino , Persona de Mediana Edad , Tipificación de Secuencias Multilocus , Intoxicación Alimentaria por Salmonella/microbiología , Infecciones por Salmonella/epidemiología , Salmonella typhimurium/clasificación , Salmonella typhimurium/genética , Suecia/epidemiología , Secuenciación Completa del GenomaRESUMEN
Over a period of less than four weeks, 50 human cases of cryptosporidiosis were reported from a relatively small geographical area in Sweden. All cases were associated with visits to cattle spring pasture events at two farms (referred to as Farm A and B). Epidemiological and microbiological evidence show that contact with calves at the farms was the most likely source of Cryptosporidium infections. Gp60 sequences from human and calf isolates at Farm A were identical to each other, but differed from those at Farm B where, again, human and calf gp60 sequences were identical, proving that the two outbreaks had no common origin. As a direct consequence of these two outbreaks, and guided by knowledge gained from the outbreak investigations, the Swedish Board of Agriculture and all relevant farmer advisory organizations have updated their hygiene instructions for farm visits.