| Date | 1675 |
| Author | Leeuwenhoek |
| Contribution | Observed and reported animalcules in rainwater, canal water, etc. |
| Reference | Garrison |
| Notes | Observed in summer, reported in letters of December 1675 and January 1676. See Dobell 1932. No mention of parasitic forms, so this entry included only to clarify the use of various dates for Leeuwenhoek's discovery of the protozoa. |
| Category | Microscopy |
| Pathogen Class | Protozoa |
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