Sequencing and analysis of gyrA and parC genes and the QRDRs in laboratory-induced ciprofloxacin-resistant mutants of Shigella flexneri 2a
zhang ji yu 1 ; deng xu ming 2 ; yan ji ye 2 ; jin qi 3 ; hou yun de 3 (1. lanzhou institute of animal science and veterinary pharmaceutics; chinese academy of agricultural sciences; lanzhou 730050; china; 2. department of animal science and veterinary medicine; the quartermaster university of pla; changchun 130062; china; 3. state key laboratory for molecular virology and genetic engineering; beijing 100052; china)