[Outbreak of Legionnaires' disease in a restaurant in the Community of Madrid, Spain]. / Brote de legionelosis en un restaurante de la Comunidad de Madrid.

BACKGROUND: on June 27, 2012, 46 cases of community- acquired Legionnaires'disease were detected in the Public Health Service area 8 of the Community of Madrid. All of them had been in the same restaurant of the city of Móstoles within the incubation period of the disease. METHODS: this is a descriptive study. Variables studied in the patients were: demographic data, medical history, symptoms, clinical course and diagnostic tests. For qualitative variables, frequencies and percentages were calculated. For quantitative variables, mínimum, máximum and average of values were calculated. In water samples taken on risk devices, we studied chlorine concentration, pH, temperatura and presence of Legionella. RESULTS: Legionella pneumophila Serogrupo 1, Subgrupo Pontiac Allentown/France was isolated from the water culture from the sand filter of the outside fountain's treatment plant; this result coincided with the strain isolated from respiratory samples of 4 patients. On the other hand, in biofilm samples obtained from the champagne bucket it was detected by PCR the presence of Legionella pneumophila whose gene sequencing was identical to that found in a respiratory sample of one patient. CONCLUSION: Legionella pneumophila serogroup 1 subgroup Pontiac Allentown/France serotype 448 was isolated in water samples, and this Legionella coincided with the one isolated from respiratory samples of some patients. So, we could show the link between environmental risk factor and the disease. This link was also confirmed by genetic sequencing with PCR.

Brote de Legionelosis en un restaurante de la Comunidad de Madrid / Outbreak of legionnaires' disease in a restaurant in the Community of Madrid, Spain

Fundamentos: el 27 de Junio de 2012 se detectó en el Servicio de Salud Pública del Área 8 de la Comunidad de Madrid un brote de legionelosis con 46 personas afectadas. Todas habían estado en el mismo restaurante del municipio deMóstoles dentro del periodo de incubación de la enfermedad. El objetivo de este trabajo es describir la evolución del brote y las medidas sanitarias adoptadas durante el mismo. Métodos: se trata de un estudio descriptivo. Se estudiaron las variables demográficas de los enfermos , antecedentes patológicos, síntomas, evolución clínica y pruebas diagnósticas. Para las variables cualitativas se calcularon frecuencias y porcentajes. Para las variables cuantitativas la media, el valor mínimo y máximo. En las muestras de agua tomadas en las instalaciones de riesgo se estudió concentración de cloro, pH, temperatura y presencia de Legionella. Resultados: en el cultivo del agua del filtro de arena de la depuradora de la fuente exterior creció Legionella pneumophila Serogrupo 1, Subgrupo PontiacAllentown/France. Este resultado coincidió con la cepa aislada en las muestras respiratorias de 4 pacientes. Por otro lado, en las muestras de biopelícula obtenidas en la champanera se detectó por PCR la presencia de Legionella pneumophila cuya secuenciación de genes fue idéntica a la encontrada en la muestra respiratoria de un paciente. Conclusiones: se consiguió aislar Legionella pneumophila serogrupo 1 Subgrupo Pontiac Allentown/France serotipo 448 en muestras ambientales, coincidente con la Legionella aislada en muestras respiratorias de algunos pacientes, por lo que se pudo demostrar la vinculación entre el factor de riesgo ambiental y la enfermedad. Este vínculo se confirmó además por secuenciación genética realizada por PCR (AU)

Background: on June 27, 2012, 46 cases of community- acquired Legionnaires' disease were detected in the Public Health Service area 8 of the Community of Madrid.All of them had been in the same restaurant of the city of Móstoles within the incubation period of the disease. Methods: this is a descriptive study. Variables studied in the patients were: demographic data, medical history, symptoms, clinical course and diagnostic tests. For qualitative variables, frequencies and percentages were calculated. For quantitative variables, mínimum, máximum and average of values were calculated. In water samples taken on risk devices, we studied chlorine concentration, pH, temperatura and presence of Legionella. Results: Legionella pneumophila Serogrupo 1, Subgrupo Pontiac Allentown/France was isolated from the water culture from the sand filter of the outside fountain' s treatment plant; this result coincided with the strain isolated from respiratory samples of 4 patients. On the other hand, in biofilm samples obtained from the champagne bucket it was detected by PCR the presence of Legionella pneumophila whose gene sequencing was identical to that found in a respiratory sample of one patient. Conclusion: Legionella pneumophila serogroup 1 subgroup Pontiac Allentown/France serotype 448 was isolated in water samples, and this Legionella coincided with the one isolated from respiratory samples of some patients. So, we could show the link between environmental risk factor and the disease. This link was also confirmed by genetic sequencing with PCR (AU)