| Date | 1842 |
| Author | Steenstrup |
| Contribution | Published theory of Alternation of Generations, based in part on the life cycle of parasitic worms. |
| Reference | Garrison & Morton |
| Notes | Relevant to demise of Spontaneous Generation, and thus to rise of Germ Theory. |
| Category | Miscellany |
| Pathogen Class | Helminths |
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