| Date | 1845 |
| Author | Siebold |
| Contribution | Published his conclusion that protozoa were single-celled animals. |
| Reference | Anon. |
| Notes | More fully, von Siebold. A very important clarification in view of the emerging cell theory of animal and plant structure. Coined the word protozoa. |
| Category | Miscellany |
| Pathogen Class | Protozoa |
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