Objective: To isolate and screen antibiotic producing actinomycetes from potential soil samples
of Gondar town, Ethiopia.
Methods: Fifteen soil samples were collected, serially diluted and spread on starch casein
and oat meal agar supplemented with amoxicillin and cyclohexamide for inhibition of bacteria
and fungi, respectively. Cross streak method was used to check antagonistic activity of isolated
actinomycetes against test organisms. Solid state fermentation and crude extraction were used for
the production of antibiotics from isolates. Agar well diffusion was used for antimicrobial activity
of crude extracts against test organisms.
Results: Three isolates (Ab18, Ab28 and Ab43) have been shown high antagonistic activity during
primary screening. Inhibition zones obtained from crude extracts showed significance differences
when compared with standard antibiotics tested against test organisms (P