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===''Haemophilus characteristics''===
===''Haemophilus'' characteristics===
*Morphologically variable Gram-negative bacilli, ranging from short rods to long filaments
*Morphologically variable Gram-negative bacilli, ranging from short rods to long filaments
===''Haemophilus somnus''===
===''Haemophilus somnus''===
*''Haemophilus sommus'' in [[Bacterial infections#Enzootic pneumonia of calves|Enzootic pneumonia of calves]]
*Cattle
*Causes infectious thromboencephalitis in cattle 1-3 years old
**''Haemophilus sommus'' in [[Bacterial infections#Enzootic pneumonia of calves|Enzootic pneumonia of calves]]
*Found in the USA and Europe, including UK
**Septicaemia
*Causes a meningoencephalitis with fibrinous arterial thrombosis and necrosis
**Causes infectious thromboencephalitis, bronchopneumonia and sporadic reproductive tract infections in cattle 1-3 years old
*Causes fever, staggering and dyspnoea, progressing to somnolence, paralysis and death
**Found in the USA and Europe, including UK
*Mortality can be high
**Causes a meningoencephalitis with fibrinous arterial thrombosis and necrosis
**Causes fever, staggering and dyspnoea, progressing to somnolence, paralysis and death
**Mortality can be high
*Sheep
**Epididymitis in young rams
**Vulvitis, mastitis and reduced reproductive performance in ewes
**Septicaemia, arthritis, meningitis and pneumonia in lambs