Microflora of pneumonic lungs in a pig herd established by hysterectomy.

Mycoplasmas and other micro-organisms are recorded from a pig herd originally derived by hysterectomy. Complement fixation tests were positive for Mycoplasma hyopneumoniae 20 months after the first hysterectomy. Following a marked increase in pneumonic lesions found at slaughter, and after modifying the culture medium M hyopneumoniae was isolated. The principal micro-organism associated with this mycoplasma was Pasteurella multocida.