摘要：Background: Mycoplasma hyorhinis (M. hyorhinis) is a bacterium commonly found in the upper respiratory tract of
healthy pigs and an agent of polyserositis and polyarthritis. Moreover, it can carry antibiotic resistance genes (Wu
et al, Vet. Microbiol. 76: 25–30, 2000). Economic losses caused by M. hyorhinis can be reduced by antibiotic therapy,
however, isolation and antimicrobic susceptibility profile are rarely performed.
Case presentation: The present report describes a case of pericarditis caused by M. hyorhinis in a weaned piglet
with respiratory symptoms and reduced growth performance.
At post mortem examination, the main macroscopic finding was a severe fibrinous pericarditis and M. hyorhins was
the only agent isolated from the pericardial fluid.
In this strain, Minimum Inhibitory Concentration (MIC) determination revealed resistance to various antimicrobial
molecules such as erythromycin, tylosin and tilmicosin.
Conclusion: This paper highlights the importance of including M. hyorhins in the differential diagnosis of polyserositis
in swine. Moreover, due the possible presence of multidrug resistance, the determination of antimicrobial susceptibility
pattern should be performed on a regular basis.
