Читать книгу Farm Animal Medicine and Surgery - Graham R Duncanson - Страница 208

The Orthobunyavirus that causes this disease of cattle is named after the town of Schmallenburg in North West Germany where it was first discovered in August 2011. By the time of writing, it had spread to most of Western Europe. SBV is spread by Culicoides obsoletus and C. dewulfi and is reportable but not notifiable in the UK. Clinical signs seen in cattle include fever, reduced milk yields, inappetence, weight loss and diarrhoea. These signs are transitory, but the most important result is the formation of congenital abnormalities if the virus affects the cow when 8-16 weeks pregnant. The abnormalities seen are limb contracture, brain abnormalities and a twisted neck (see Plate 3). These may result in the need for an embryotomy or a Caesarean section. Cows after parturition do not appear to be shedding virus.