Ma. Thirunarayanan et al., RESISTANCE OF SHIGELLA TO NALIDIXIC-ACID AND FLUORINATED QUINOLONES, Indian journal of medical research. Section A: Infectious diseases, 97, 1993, pp. 239-241
It is known that nalidixic acid resistance is a relatively rare phenom
enon among shigellae. Between June 1989 and May 1990, six strains of s
higellae resistant to nalidixic acid were isolated. These strains also
exhibited resistance to three newer fluoroquinolones, viz.. ciproflox
acin, pefloxacin and enoxacin. In repeated experiments, nalidixic acid
resistance did not transfer to a suitable recipient.