February 24 2010
DEFRA'S veterinary surveillance programme has flagged up two new diseases that farmers need to be aware of.
The first, psoroptic mange in cattle, which is caused by a parasitic mite, was diagnosed by the Veterinary Laboratories Agency (VLA) during 2008/2009. These are the first cases of psoroptic mange since the 1980s, and the disease was probably introduced by imported cattle from Europe. There is no link with sheep scab.
Clinical signs increase in colder weather, when the mites are more active. The mites cause severe skin irritation (dermatitis) with scab formation along the back, shoulders and tail head of cattle. Secondary infection commonly leads to bleeding and crusting of the skin, and weight loss and death can occur if lesions are extensive. Cattle owners should take care when purchasing animals, and contact their vet if any of the above symptoms occur.
The second, Derszy’s disease (or goose parvovirus disease), is caused by goose parvovirus type I, and is restricted to domestic and wild geese and Muscovy ducks. It is thought to have been introduced to the country via imported goslings from Europe. Clinical signs depend on the age of the bird at the time of the infection, but can include weakness, discharges from the eyes and diarrhoea. Mortality can be 100% for birds less than one week old, with infection in older birds often leading to growth retardation.
The virus is excreted in large quantities in faeces, which can result in rapid spread by direct and indirect contact. Adult birds can act as carriers, spreading the disease to the next generation. An effective vaccine to protect against the disease is available. For more information, either contact your vet or visit the VLA website.