Antibiotics are medicines that are produced by certain micro-organisms to kill other disease-causing micro-organisms. These medicines are commonly obtained from bacteria and fungi.
The species of fungus used in the production of antibiotics are:
| Antibiotic | Fungus source | |
| 1 | Penicillin | Penicillium notatum |
| 2 | Cephalosporin | Cephalosporium acremonium |
There are several valuable microorganisms that are beneficial to humans in various manners such as: