| haemophilus somnus infections i. a ten year (1969-1978) retrospective study of losses in cattle herds in western canada. | a total of 838 outbreaks of fatal haemophilus somnus infections in herds of cattle were diagnosed at provincial veterinary laboratories in manitoba, saskatchewan, alberta and british columbia during the period 1969-1978. the index cases from these outbreaks included 759 cases of thromboembolic meningoencephalitis, 78 cases of fibrinous pneumonia with pleuritis and one case of h. somnus abortion. the epizootics were subdivided on the basis of province, class and age of cattle and seasonal occurre ... | 1980 | 7397616 |