Scrapie - Advisory notes for farmers

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It is rarely reported in goats in the UK but, again, the possibility of the diseasecannot be ruled out.Numbers affectedBecause clinical signs of disease appear a long time after initial infection,cases generally appear singly in a flock. This is very different from diseasessuch as sheep scab (psoroptic mange), which can spread quickly through aflock. Occasionally, several cases can occur over a short period of time, mostlyin animals born at about the same time and possibly to the same sire.SeasonCases can occur at any time of year, but stress can cause the clinical signs toappear. Cases are often more easily identified at times when sheep and goatsare collected for management purposes, such as when sheep are brought infor lambing, or in the autumn, at tupping.Development of clinical signsMost sheep show a gradual development of clinical signs over a period ofseveral weeks or even months, although in some cases an animal’s conditionmay worsen rapidly. Some sheep and goats affected with scrapie may just befound dead without showing any clinical signs beforehand.Clinical signs of scrapieIrritation●●●repeated rubbing of flanks and hindquarters against objects such asfences, posts or hay racksrepeated scratching of the flanksnibbling or grinding teeth when rubbing themselves or when rubbedfirmly on the back3
●●●continued scratching of the shoulder or ear with a hind footunusual or agitated nibbling of the feet, legs or other parts of the bodyexcessive wool loss or damage to the skinChanges in behaviour●●●●●●becoming excitabledrooping earsincreased nervousness or fear responselagging behindaggressiondepression or vacant stareChanges in posture and movement●●●●●●●trembling (mainly of the head)unusual high stepping trot in early stagessevere incoordinationstumblingstanding awkwardlyweak hind legsunable to standLater clinical signs●●weight lossdeath4
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Scrapie - Advisory notes for farmers

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