''M. hyosynovia'' and ''M. hyorhinis'' are species of ''[[Mycoplasmas species - Overview|Mycoplasmas]]''. They produce syndromes similar to [[Haemophilus parasuis|Glasser's disease]] with milder expression, rarely menigitis and [[Joints Inflammatory - Pathology#In Pigs|arthritis]].
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''M. hyosynovia'' and ''[[Mycoplasma hyorhinis|M. hyorhinis]]'' are species of ''[[Mycoplasmas species - Overview|Mycoplasmas]]''. They produce syndromes similar to [[Haemophilus parasuis|Glasser's disease]] with milder expression, rarely menigitis and arthritis.
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''M. hyorhinis'' causes a chronic progressive polyserositis in pigs under 10 weeks old resulting in a fever, laboured breathing, lameness and swollen joints. Serofibrinous pleurisy, pericarditis and [[Peritonitis#In pigs|peritonitis]] occur.