Diagnosis of anorectal tuberculosis by polymerase chain reaction, GeneXpert and histopathology in 1336 samples in 776 anal fistula patients

Table 2 Detection time of tuberculosis in patients who underwent surgery for anal fistula

Detection of TB	Total patients operated for anal fistula (n = 113)
After first surgery	89/113 (78.8%)
Repeat samples in patients with high level of suspicion1	18/113 (15.9%)
Samples in patients with Recurrence of fistula	6/113 (5.3%)

¹Non-healing of fistula, occurrence of new abscesses during treatment or delayed recurrences (fistula recurring 3-6 mo after complete healing). Tuberculosis detected in out-patient department (Patients not operated): 9. TB: Tuberculosis.