They found 50 bacterial isolates and only 10 had the specific properties they were looking for- 10 individual bacterium.
The 10 selected isolates were identified as the avermectin-producing strain by fermentation and characterized on ISP2 medium for aerial and reverse side mycelia color, soluble pigment color and melanin formation, in comparison with S. avermitilis DSM 41445. The best avermectin-producing isolate S1-C (10.15 mg/L) showed similar result as S. avermitilis DSM 41445, when subjected for culture characteristics analysis in different media along with biochemical characterization.
It has been. Below is a study with samples being tested from Pakistan
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4217667/
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They found 50 bacterial isolates and only 10 had the specific properties they were looking for- 10 individual bacterium.