(Diseases, Clinical Signs, and Pathogenesis)
1. Found where?
2. biotype? serotype?
3. Produces what in cattle?
4. what in sheep?
5. Resistance to cope with infection is diminished by what?
6. Infection mutliplies rapidly where and travels where?
7. Cattle under stress shed P. Haemolytica in greater numbers and frequency
1. upper respiratory tract of cattle and sheep
2. Biotype A - Serotype 1
3. acute fibrinous pleuropneumonia in cattle (Shipping fever in cattle)
5. environmental stress
6. multiplies in nasopharynx, travels to lungs
1. Alveolar macrophages in the lung phacocytize M. Haemolytica and can degrade some how quickly?
2. Do some escape phagocytosis?
3. What is produced that kills macrophages and contributes to lung lesions?
4. M. Haemolytica also produces what three things?
1. within sixty minutes
2. yes - large numbers
3. M. haemolytica
4. haemolysis, neuraminidase, and proteolytic enzymes
(Mannheimia Haemolytica Diagnosis)
1. What do they look like on a MacConkey's plate?
2. Cultures obtained from what will be diagnositc?
1. very small pink colonies
2. from tracheal swabs or washes or from lung lesions
1. G+ or G-?
5. What do colnoies look like?
6. .5-1mm in diameter
5. grayish, round, semi-transparent colonies
1. Causes decreased egg production
2. Particularly affects what?
3. seen in both commercial layers and breeders
4. lesions seen include (look at pic)
2. the reproductive tract
1. Birds are most susceptibe when?
1. between 22 and 34 weeks of age