What microorganism was cultured from this lesion?

In a 4 months old lamb carcass a color change of the right apical lung lobe was observed, it was darkened and had a hardened consistency.

Apical right lung lobe. Darkened and hardened  (cut in the image). 

The lesion from the opposed side. The pleura is also involved and the tracheobronchial lymph node is enlarged.


What is your diagnosis ? (44)


Histopathology revealed lesions of a subacute severe fibrinous pleuropneumonia, compatible with a bacterial infection. On microbiological culture  Mannheimia haemolytica was isolated. The rest of proposed bacteria can also cause bacterial pneumonia in sheep.
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Question 1
Which bacteria was cultured from this lesion?
Mycoplasma ovipneumoniae
Mannheimia haemolytica
Pasteurella multocida
Helcococcus ovis
Histophilus somni
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