Lamb diseases coincident with Louping-Ill

Studies on the haematology of sheep

“…In the course of the routine examination of dead lambs received at this Institute, and also in extensive examination of lambs in the field, it has been found that under the flockmasters' diagnosis of " louping -ill " is included a number of diseases among which are those clinical conditions which result from infection with any combination of the tick -borne diseases and pyaemia. This pyaemic condition is that described by M'Fadyean' (1894) and again by Stewart and Ponsford (1937). Both authors refer to the isola ;ion of a slightly chromogenic Gram -positive micrococcus from the abscesses, and our own experience has been that an organism morphologically and culturally resembling Staphylococcus aureus can be isolated both from superficial and deeply seated abscesses.…”

“…-The Nature of the Infections Produced EVIDENCE REGARDING THE INCIDENCE OF PYAEMIA Evidence regarding the incidence of pyaemia in lambs as it occurs on tick -infested farms has been provided by M'Fadyean (1894), who estimated that approximately half of the lambs submitted to him as' being affected with louping -ill were actually infected with pyaemia. Stewart and Ponsford (1937) record that " of 209 lambs examined after death on tickinfested pasture pyaemic infections were noted in 100 cases, andin all probability were the cause of death in 80 cases." In 1939 we examined 69 lambs from a group of tick -infested farms and found that 20, or 29 per cent., were affected with pyaemia, while in 1940, of 193 lambs obtained from the same group of farms, 57, or 29 per cent., were affected with pyaemia.…”

Studies on the haematology of sheep

“…Evidence regarding the incidence of pyaemia in lambs as it occurs on tick -infested farms has been provided by M'Fadyean (1894), who estimated that approximately half of the lambs submitted to him as' being affected with louping -ill were actually infected with pyaemia. Stewart and Ponsford (1937) record that " of 209 lambs examined after death on tickinfested pasture pyaemic infections were noted in 100 cases, andin all probability were the cause of death in 80 cases." In 1939 we examined 69 lambs from a group of tick -infested farms and found that 20, or 29 per cent., were affected with pyaemia, while in 1940, of 193 lambs obtained from the same group of farms, 57, or 29 per cent., were affected with pyaemia.…”