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Comparison of natural product antibiotic screenings by Eli Lilly and LEO 1949–1959a.
| Number of | Eli Lilly | LEO |
| Soil samples | 10,000 | No data |
| Microorganisms examined | 200,000 | No data |
| Microorganisms with antimicrobial activity | 25,000 | 300 |
| Number of compounds analyzed | 300 | 32 |
| Number of compounds reaching the market | 3 | 0 |
aData for Eli Lilly from Kahn (1975), and for LEO from this study.
