RESUMEN
In June-November 2020, SARS-CoV-2-infected mink were detected in 290 of 1,147 Danish mink farms. In North Denmark Region, 30% (324/1,092) of people found connected to mink farms tested SARS-CoV-2-PCR-positive and approximately 27% (95% confidence interval (CI): 25-30) of SARS-CoV-2-strains from humans in the community were mink-associated. Measures proved insufficient to mitigate spread. On 4 November, the government ordered culling of all Danish mink. Farmed mink constitute a potential virus reservoir challenging pandemic control.
Asunto(s)
Animales Salvajes/virología , COVID-19/epidemiología , COVID-19/veterinaria , Brotes de Enfermedades/veterinaria , Reservorios de Enfermedades/veterinaria , Transmisión de Enfermedad Infecciosa/veterinaria , Visón/virología , Pandemias/veterinaria , SARS-CoV-2/genética , SARS-CoV-2/aislamiento & purificación , Zoonosis Virales/transmisión , Animales , COVID-19/transmisión , COVID-19/virología , Prueba de Ácido Nucleico para COVID-19 , Dinamarca/epidemiología , Brotes de Enfermedades/estadística & datos numéricos , Reservorios de Enfermedades/virología , Granjas , Genes Virales , Humanos , Incidencia , Reacción en Cadena de la Polimerasa , Salud Pública , ARN Viral/análisis , ARN Viral/genética , SARS-CoV-2/clasificación , Zoonosis Virales/virología , Secuenciación Completa del Genoma , Zoonosis/transmisión , Zoonosis/virologíaRESUMEN
The aim of the study was to characterize the different types of muscle hemorrhages in the ham and tenderloin of CO2-stunned slaughter pigs. The distinct types of hemorrhages were characterized according to their distribution and size. The hemorrhages in the ham were multiple, pinpoint hemorrhages predominantly distributed in the caudal part of the muscle. The hemorrhages in the tenderloin were single and circular, located either at the tip or the head. Histologically, three distinct types of hemorrhages were observed. Type 1, which was peracute (<4h old), and present in both the ham and the tenderloin. Type 2, which was acute (>4h old), and restricted to the ham. Type 3 contained bone marrow and cartilage, was peracute (< 4h old) and restricted to the tenderloin.
Asunto(s)
Mataderos , Hemorragia/diagnóstico , Músculo Esquelético/metabolismo , Animales , Estudios Transversales , Carne Roja , PorcinosRESUMEN
Muscle hemorrhages are regularly observed in especially the tip of the tenderloin muscles of slaughter pigs. In order to characterize the hemorrhages, a macro- and microscopic examination of tenderloins with (n=5) and without (n=4) hemorrhages and the associated vertebral column was carried out. Furthermore, all columns were radiographed and two were CT scanned. Histologically, the muscle hemorrhages contained cells from bone marrow and growth line cartilage. Ventral epiphysiolysis in either the cranial or caudal epiphysis of the first lumbar vertebrae (L1) in 8 out of the 9 vertebral columns was present. In the 5 cases with tenderloin hemorrhage, similar hemorrhage with growth line cartilage was found within the fracture of the epiphysis. The hemorrhages develop secondarily to epiphysiolysis in the lumbar vertebrae, where the tenderloin attaches to the spine. The lesions probably develop around the time of stunning.