Experimental infection of calves with Mycoplasma dispar

Abstract

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Bacterial pathogens of the lower respiratory tract of calves from Brazilian rural settlement herds and their association with clinical signs of bovine respiratory disease

“…Statistical tendency was observed between M. dispar and tachypnea. In an experimental infection of M. dispar in calves, Ribeiro (1979) reported that only one calf showed clinical signs of BRD and that M. dispar pneumonia might be a mild infection.…”

Evaluation ofMollicutesMicroorganisms in Respiratory Disease of Cattle and Their Relationship to Clinical Signs

“…Regarding M. dispar, our data indicated an association between this bacterium and tachypnea and mixed dyspnea. In an experimental infection with M. dispar in calves , most calves showed no clinical signs of BRD . However, only 1 calf showed persistent nonproductive cough and dyspnea, besides increased respiratory rate and fever.…”

“…Recently, another study indicated that coarse crackles and whistling were associated with the absence of M. dispar . Mycoplasma dispar is regularly isolated from bovine pneumonic lungs, but its presence has been associated with mild infection . Discrepancies in results allow researchers to continue studying these microorganisms to better understand the importance of mycoplasmas in the development of clinical signs of BRD.…”

“…In an experimental infection with M. dispar in calves, most calves showed no clinical signs of BRD. 34 However, only 1 calf showed persistent nonproductive cough and dyspnea, besides increased respiratory rate and fever. Recently, another study indicated that coarse crackles and whistling were associated with the absence of M. dispar.…”

“…31 Mycoplasma dispar is regularly isolated from bovine pneumonic lungs, but its presence has been associated with mild infection. 30,34 Discrepancies in results allow researchers to continue studying these microorganisms to better understand the importance of mycoplasmas in the development of clinical signs of BRD. In addition, it is important to note that other microorganisms could contribute to BRD.…”