| Date | 1889 |
| Author | Grassi |
| Contribution | With Rovelli, reported flea as intermediate host for Dipylidium caninum. |
| Reference | Grove |
| Notes | A common tapeworm of dogs and cats. The possibility of the flea as a vector had been considered, and rejected, by Sonsino in 1888. |
| Category | Causation |
| Pathogen Class | Helminths |
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