5Campoecia D, Montanaro L, Speziale P, et al. Antibiotic -loaded biomate- rials and the risks for the spread of antibiotic resistance following their prophylactic and therapeutic clinical use [ J ]. Biomaterials, 2010,31 (25) : 6 363 - 6 377.
6Alanis AJ. Resistance to antibiotics: are we in post- antibiotic era[J] Arch Med Res, 2005,36 (6) : 697 - 705.
8Berge AC, Atwill ER, Sischo WM. Animal and farm influences on the dy- namics of antibiotic resistance in faecal Escherichia coli in young dairy calves [J]. Prey vet Med. 2005,69( l - 2) :25 - 38.