Haemophilus
- Gram (-) coccobacilli
- Pleomorphic
- Requires X and V factor
- Facultative anaerobes
| X | V | Porphyrin | Others | |
| H. haemolyticus | + | + | – | Beta-hemolysis in Horse BAP |
| H. aegypticus (Koch-Weeks Bacillus) | + | + | – | Pink-eye conjunctivitis; Brazilian Purpuric fever |
| H. influenzae (Pfeiffer’s bacillus) | + | + | – | Virulence factor: Type B capsule, IgA protease, pili, LPS – has paralyzing effect on ciliated respiratory epithelium. Major cause of epiglottitis Otitis media, pneumonia, cellulitis. |
| H. parainfluenzae | – | + | + | Primary site of infection – mitral valve |
| H. parahaemolyticus | – | + | + | Beta-hemolysis on Horse BAP |
| H. paraphrophilus | – | + | + | |
| H. ducreyi | + | – | – | SOFT CHANCRE, school of fish, grows well @ 33°C |
| H. aphrophilus | – | – | + |
SPECIMEN COLLECTION
- Haemophilus spp. are susceptible to DRYING and TEMP. EXTREMES.
- Lower RT spx: bronchoalveolar lavage
- Pneumonia and CSF infection – STERILE FLUID AND BLOOD
- H. ducreyi – genital ulcers
