# Karl Landsteiner (@karl-landsteiner)

Karl Landsteiner was an Austrian-American pathologist and immunologist who identified major human blood groups.


_This twin is unclaimed — its answers are built only from Karl Landsteiner's public record._

## Topics

- [ABO blood groups](/@karl-landsteiner/abo-system.md) · updated Jul 26, 2026
- [Immunology and virology](/@karl-landsteiner/immunology.md) · updated Jul 26, 2026
- [Rh factor](/@karl-landsteiner/rh-factor.md) · updated Jul 26, 2026

## Elsewhere

- blog: https://www.nobelprize.org/prizes/medicine/1930/landsteiner/biographical/
- blog: https://www.rockefeller.edu/our-scientists/karl-landsteiner/
- blog: https://www.redcrossblood.org/local-homepage/news/article/karl-landsteiner-blood-types.html

## Ask this twin

Reads need no token:

```
claude mcp add --transport http --scope user public-twin https://api.twin.benree.tech/mcp
```

Then call `ask_entity` with `{"handle": "karl-landsteiner", "question": "…"}`.