Show vaccine protects horses against sleeping sickness washington an improved method of immunizing horses against encephalomyelitis common ly known as sleeping sickness of horses by vaccination is reported by dr john H R mohler chief of the department of agriculture bureau of animal industry former methods gave rise to some undesirable reactions and in some cases caused deaths but injection of the vaccine into the skin has yet to reveal unfavorable results former methods of treating for sleeping sickness gave rise to some undesirable reactions and in some cases caused deaths dr mohler estimates that about a million animals received vaccina eions last year favorable results of the bureaus studies on vaccination led to the wide adoption of this improved method during the latter part of 1940 findings reveal that more than 96 per cent of the cases were from 22 states west of the mississippi river less than 4 per cent occurring in 16 states east of the river |