The availability of antibiotic ingredients in serum was tested by drawing venous blood from the ear of the animals and centrifuging it for 10 min at 3,500 × g (Varifuge 3.0R; Heraeus Sepatech, Germany). Serum samples were taken after 24, 48, and 72 h as well as after days 7, 14, 21, and 28 and stored at −20°C until analysis at the LC Labor Consult GmbH (Germany). An ADVIA 1650 Chemistry System (Siemens Healthcare Diagnostics, Germany) was used to determine antibiotic levels in serum for gentamicin, vancomycin, and tobramycin.
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