豬病：對抗生素的抗藥性可以在幾個葡萄球菌屬之間傳播（英語）

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Antibiotic resistance may spread between types of staphylococcus 20 Jul 2010
Antibiotic resistance determinants may spread between several types of staphylococci in pigs.
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Pig Progress Editor Vincent ter Beek reports from IPVS, Vancouver

That was one of the conclusions drawn by Dr Jeonghwa Park at her presentation during the International Pig Veterinary Society (IPVS) Congress, held in Vancouver, BC, Canada, from 18-21 July.

Exudative epidermitis
She spoke about the research of her team at the University of Guelph, ON, Canada, to Staphylococcus hyicus – a variety known to cause exudative epidermitis, also known as greasy pig disease. Other scientists on the team were Robert Friendship, Cate Dewey, Scott Weese and Zvonimir Poljak.

A different type of staphylococcus, Staphylococcus aureus, is known for sometimes being resistent to antibiotics, referred to then as Methicillin-Resistant Staphylococcus Aureus (MRSA). It is widely discussed as to whether this type of staphylococcus may or may not have obtained its antibiotic resistance through medication use in livestock.

Ontario
A survey at 30 farms in Ontario, Canada, using injectible antibiotics (tetracycline) to treat EE, focused on the presence of a mecA gene, which determines the extent of antimicrobial resistance. Park observed: “…all isolates from cases of EE were shown to be resistant to not only penicillin but in most cases resistant to the entire family of beta-lactam antibiotics. These results explain why farmers reported a poor response to treatment of EE.”

Park concluded that treatment of greasy pig disease is thus a problem as a consequence of widespread antibiotic resistance.

Since MRSA is widespread at Ontario farms, she added, that possibly antibiotic resistance determinants (genetic material) are spreading between S. hyicus and S. aureus.

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