Emergence of nalidixic acid resistance in Shigella sonnei isolated from patients having acute diarrheal disease: report from eastern province of Saudi Arabia.

During the 5 years of the study period (October 1999-October 2003), 110 strains of Shigella were isolated from fecal samples of patients having acute diarrheal diseases. Shigella sonnei phase 1 was the most prevalent (88/110, 80.0%) serotype.