RESUMEN
The objective of this study was to determine the occurrence of Mycoplasma hyopneumoniae in the lower respiratory tract of suckling and recently weaned pigs from herds with a history of endemic respiratory disease in this age group. Bronchoalveolar lavage fluid was obtained from 500 clinically affected piglets originating from 50 herds (10 piglets per herd). The presence of M. hyopneumoniae was examined by application of a nested polymerase chain reaction. Mycoplasama hyopneumoniae was detected in lavage fluid in 12.3% of the suckling piglets and 10.6% of the weaned piglets (mean 11.2%). The percentage of herds in which M. hyopneumoniae could not be detected was 72% and in two of the herds all samples were tested positive. Herd level information on relevant hygiene, housing and management factors was obtained by means of a structured questionnaire. The univariable data analysis (odds ratio) showed that the detection of M. hyopneumoniae in young piglets is associated with one- and two-site production and inappropriate gilt acclimatization.
Asunto(s)
Líquido del Lavado Bronquioalveolar/microbiología , Mycoplasma hyopneumoniae , Neumonía Porcina por Mycoplasma/epidemiología , Animales , Animales Recién Nacidos , Animales Lactantes , Femenino , Masculino , Mycoplasma hyopneumoniae/aislamiento & purificación , Neumonía Porcina por Mycoplasma/inmunología , Neumonía Porcina por Mycoplasma/microbiología , Reacción en Cadena de la Polimerasa/veterinaria , Embarazo , Prevalencia , PorcinosRESUMEN
Swinepox virus infection results in an acute, mild or subclinical course and is characterised by typical poxvirus skin lesions in affected pigs. Additionally, sporadic vertical swinepox virus transmission leads to congenital generalised infection and subsequent abortion or stillbirth. The present report describes the occurrence of epidermal efflorescences in two piglets after intrauterine natural suipoxvirus infection. No clinical abnormalities of the gilt and littermates as well as in other pigs from this herd were present. One of the affected piglets was stillborn and submitted for necropsy, the other animal was alive at birth, but died 3 days later. Histologically, a proliferative to ulcerative dermatitis with epithelial ballooning degeneration and characteristic intracytoplasmatic inclusion bodies was observed. The pathomorphological and histopathological suspected diagnosis of a poxvirus infection was confirmed by electron microscopy. Furthermore, the agent was identified as suipoxvirus by polymerase chain reaction. As demonstrated here, obvious skin lesions in suipoxvirus infection leads to a suspected diagnosis in newborn piglets on macroscopic examination. However, further post mortem examinations, including electron microscopy as well as molecular techniques are essential for the identification of the aetiology and the exclusion of differential diagnoses. Because the disease only affected two pigs there was only a small economic loss. A valid diagnostic plays an important role in advising farmers and for herd health monitoring.