Sweating sickness in adult cattle.

A Kenyan strain of Hyalomma truncatum was shown to cause sweating sickness in adult cattle in the laboratory. The typical lesions of moist eczema and mucous membrane changes were accompanied by a marked fall in circulating leucocytes with a severe neutropenia. Although all cattle recovered, some suffered a severe clinical disease and recovery was slow. Recovered cattle were immune to toxicosis 1 year later.