Difference between revisions of "Haemophilus species"
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**Acute septicaemia | **Acute septicaemia | ||
**Causes a polyserositis - pericarditis, [[Peritoneal cavity - inflammatory#Peritonitis|peritonitis]], pleurisy and meningitis - in pigs 3-10 weeks old | **Causes a polyserositis - pericarditis, [[Peritoneal cavity - inflammatory#Peritonitis|peritonitis]], pleurisy and meningitis - in pigs 3-10 weeks old | ||
| + | **Also causes suppurative [[Bacterial infections#Glasser's disease|bronchopneumonia, pleuritis]], [[Joints - inflammatory#In Pigs|polyarthritis]] (also ''H. suis) | ||
**Sporadic outbreaks in the UK | **Sporadic outbreaks in the UK | ||
**Can be fatal in 2-5 days | **Can be fatal in 2-5 days | ||
**Mortality up to 50% insome outbreaks | **Mortality up to 50% insome outbreaks | ||
**Chronic arthritis, meningitis and intestinal obstruction due to adhesions in surviving pigs | **Chronic arthritis, meningitis and intestinal obstruction due to adhesions in surviving pigs | ||
| − | |||
**Expressed lesion vary between animals - meningitis is most consistent, arthritis in 20% of cases | **Expressed lesion vary between animals - meningitis is most consistent, arthritis in 20% of cases | ||
*Fibrinous pneumonia secondary to enzootic pneumonia or virus infection | *Fibrinous pneumonia secondary to enzootic pneumonia or virus infection | ||
Revision as of 15:14, 17 December 2007
- Haemophilus sommus in Enzootic pneumonia of calves
- H. pleuropneumonia in Contagious porcine pleuropneumonia
Haemophilus characteristica
- Morphologically variable Gram-negative bacilli, ranging from short rods to long filaments
- Oxidase negative
- Depend on beta-nicotinamide adenine dinucleotide (NAD) and/or Haemin for growth
- Heated blood agar (Chocolate Agar) required for growth of NAD-dependent strains
- Haemin-dependent strains grow on Blood Agar
- Do not grow on MacConkey agar
- Inhabit mucosal epithelium of respiratory and genital tract
Haemophilus parasuis
- Serotype B causes Glasser's disease in pigs
- Glasser's disease
- Due to transport, environmental stresses, dietary and managemental factors
- Acute septicaemia
- Causes a polyserositis - pericarditis, peritonitis, pleurisy and meningitis - in pigs 3-10 weeks old
- Also causes suppurative bronchopneumonia, pleuritis, polyarthritis (also H. suis)
- Sporadic outbreaks in the UK
- Can be fatal in 2-5 days
- Mortality up to 50% insome outbreaks
- Chronic arthritis, meningitis and intestinal obstruction due to adhesions in surviving pigs
- Expressed lesion vary between animals - meningitis is most consistent, arthritis in 20% of cases
- Fibrinous pneumonia secondary to enzootic pneumonia or virus infection
Haemophilus somnus
- Causes infectious thromboencephalitis in cattle 1-3 years old
- Found in the USA and Europe, including UK
- Causes a meningoencephalitis with fibrinous arterial thrombosis and necrosis
- Causes fever, staggering and dyspnoea, progressing to somnolence, paralysis and death
- Mortality can be high
Haemophilus paragalinarum
- Conjunctivitis in poultry
Haemophilus influenzae
- Human respiratory disease