Antibiotics name Symbol Concentration of antibiotics applied   Tetracycline T 30 µg Gentamycin G 10 µg Imipenem I` 10 µg Chloramphenicol C 30 µg Penicillin P 10 µg Erythromycin E 15 µg

Table 1: Six antibiotics that were tested against the E. coli isolates using standard disc.