| Date | 1857 |
| Author | Malmsten |
| Contribution | Reported Balantidium coli as pathogenic in human intestine. |
| Reference | Garrison |
| Notes | Peter Henrik Malmsten. Although not mentioned by Garrison, Malmsten concluded that the protozoon causes illness when present in large numbers. Detailed case reports. Foster (1965), perhaps referring to a preliminary observation, gives date as 1856, mentions a single case of severe diarrhea, and says the organism was Paramoecium-like but probably Balantidium coli. |
| Category | Causation |
| Pathogen Class | Protozoa |
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