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Goodwin & Whittlestone (1964, 1966) induced enzootic pneumonia in pigs with a mycoplasma-like agent grown in liquid medium. Using essentially this medium, Mare & Switzer (1965) also reproduced enzootic pneumonia with liquid-medium cultures, and from these cultures they isolated a mycoplasma on solid medium, which they called Mycoplasma hyopneumoniae. However, at least one mycoplasma other than the causal agent of enzootic pneumonia commonly occurs in the respiratory tract of pigs affected with enzootic pneumonia and it cannot be assumed, therefore, that a mycoplasma isolated on solid medium is the same as a pneumonia-inducing agent grown in parallel in liquid medium. Goodwin, Pomeroy & Whittlestone (1965) proved that the mycoplasma isolated from their pneumonia-inducing fluids was indeed the causal agent of enzootic pneumonia by passaging it serially on solid medium until a dilution of at least 10~ of the primary seed inoculum was reached; these final colonies induced enzootic pneumonia. This mycoplasma was named Mycoplasma suipneumoniae. Subsequently, M. suipneumoniae was shown to be serologically different from a wide range of other mycoplasmas (Goodwin, Pomeroy & Whittlestone, 1967), and hence it is probably a new species.

Attempts to recoverMycoplasma suipneumoniaefrom experimental and natural cases of enzootic pneumonia in pigs