Title:Tömeges fülvégelhalás egy sertésállományban - Esetismertetés
SUMMARY Background: Porcine ear necrosis syndrome (PENS) is a disease of swine char-acterized by erosive lesions at the margin of the ear. The syndrome is commonly found in weaning piglets during summer months. Morphology of the ear lesion has been divided into two stages. Initially oedematous epidermal layer with vesicles (or may be impetigo) can be found then a more severe form, deep ulcerative lesions develop as a complication of bacterial infections. PENS is a multifactorial disease and many causative agents have been suspected for the development of the syndrome. These potential triggering factors could be divided into non-infectious and infectious agents, but no definitive aetiology has been identified. Objectives: The aim of this report was presenting the clinical and pathological findings of PENS in a herd, together the actions for the solutions. Materials and Methods: Multitudinous PENS cases appeared in summer in a herd. Several risk factors were identified at the investigation of the environment of piglets such as disturbance of the water supply, sudden change in the composition of the feed, high density of animals, high temperature together with high humidity of air and wind. Histology revealed epidermal and vascular lesions in the ear tissue. Epidermal changes were characterised as hyper- parakeratosis, acanthosis, degeneration of keratinocytes, intercellular oedema. Circumscribed superficial vesicular dermatitis was detected in the epidermis which progressed to become exudative and encrusted. Lesions progressed to deep necrotic ulcer formation of granulation tissue at the base of ulcer. Beyond slight vasculitis, hyalinosis was detected in the vessels of the dermis. Results and Discussion: When most of risk factors were eliminated, the num-ber of the new PENS cases was drastically decreased. The results of the case report pointed out that PENS is mainly multifactorial as shown in other studies.