The following are abbreviated abstracts from recently published research on Mycoplasma bovis. Included are reports from the United States, Canada, and the United Kingdom.

Mycoplasma bovis Infections in Young Calves1

Mycoplasma bovis was first isolated from a case of severe mastitis in a U.S. dairy cow in 1961, almost a half century ago. It is now recognized as a worldwide pathogen of intensively farmed cattle and in recent years has emerged as an important cause of disease in young dairy calves in North America and Europe. Pneumonia, otitis media [inner ear infection], and arthritis are common manifestations of M. bovis infection in young calves. M. bovis continues to be an important cause of mastitis in adult cows and respiratory disease and arthritis in stocker and feeder cattle.

Mycoplasma bovis Pneumonia in Cattle2

Mycoplasma bovis is an important and emerging cause of respiratory disease and arthritis in feedlot cattle and young dairy calves, and has a variety of other disease manifestations in cattle. M. bovis is certainly capable of causing acute respiratory disease in cattle, yet the attributable fraction has been difficult to estimate. In contrast, M. bovis is more accepted as a cause of chronic bronchopneumonia, characterized by persistent infection that seems poorly responsive to many antibiotics. This review critically considers the relationship between M. bovis infection and the various manifestations of the Bovine Respiratory Disease complex.

Mycoplasma bovis: Disease, Diagnosis, and Control3

Mycoplasma bovis is a major, but often overlooked, pathogen causing respiratory disease, mastitis, and arthritis in cattle. It is found worldwide and has spread into new areas, including Ireland and parts of South America in the last decade. In Europe, it is responsible for at least a quarter to a third of all calf pneumonia although this may be an underestimate, as few laboratories regularly monitor for mycoplasmas. Like all mollicutes, M. bovis is inherently refractory to certain groups of antibiotics because it does not possess a cell wall; furthermore, evidence is accumulating that strains of M. bovis are becoming resistant to antibiotics, including tetracycline, tilmicosin, and spectinomycin, traditionally used for their control.

1Maunsell, FP and GA Donovan. Vet Clin Food Anim 25 (2009) 139-177.
2Caswell JL and M Archambault. Anim Health Res Reviews 8(2):161-186, 2008.
3Nicholas RAJ and RD Ayling. Res in Vet Science 74 (2003) 105-112.