# herd immunity

> protection from infectious disease that occurs when a sufficient fraction of a population has become immune (through vaccination or previous infections)

**Wikidata**: [Q736798](https://www.wikidata.org/wiki/Q736798)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Herd_immunity)  
**Source**: https://4ort.xyz/entity/herd-immunity


## References

1. Freebase Data Dumps. 2013
2. WikiUMLS: Aligning UMLS to Wikipedia via Cross-lingual Neural Ranking
3. Quora
4. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)