# NTNU researchers find medieval urban sanitation in Trondheim spread roundworm parasites

- Published: 2026-11-08 11:28 UTC
- Section: Life & Health › Biology & biochemistry
- Tags: NTNU University Museum, MedHeal600, medieval Trondheim, roundworm parasites, urban sanitation, skeletal analysis
- URL: https://realtech.media/news/rt-222184cb4bf0058c86a4a522_ntnu_researchers_find/

**Archaeological and skeletal analyses show that public sanitation reforms inadvertently aided intestinal roundworm cycles between the years 1000 and 1600.**

![NTNU researchers find medieval urban sanitation in Trondheim spread roundworm parasites](https://realtech.media/media/2026/11/0fd7f2de352c4819.jpg)
*norwegianscitechnews.com*

Archaeologists and historians from the NTNU University Museum examined public health and waste management in Trondheim between the years 1000 and 1600, according to norwegianscitechnews.com [1]. The findings, compiled under the MedHeal600 project, revealed that deliberate urban sanitation efforts produced contradictory results. While local authorities organized waste removal to clean streets and limit disease, certain interventions formed a cycle that aided the transmission of intestinal roundworm parasites [1].

During the Middle Ages, responsibility for hygiene and waste management moved from private households to communal urban administration [1]. Legal frameworks such as Magnus the Lawmender’s Norwegian Code of the Realm of 1274, followed two years later by the Town Law, assigned operational duties for the common good to local communities, supervised by royal officials [1]. Latrine waste was collected separately and moved away from densely populated city centers to pits on the periphery to eliminate odors and street dirt [1]. However, applying these human waste materials to agricultural fields allowed roundworm parasite eggs to enter the food supply, returning pathogens back to the population [1].

## Skeletal analyses and living conditions

Researchers analyzed human skeletal remains recovered from two medieval cemeteries in Trondheim using biomolecular methods, ancient DNA analysis, and isotope tracking [1]. Well over half of the inhabitants experienced physiological stress during childhood and adolescence as a result of insufficient or nutritionally inadequate diets [1]. Many individuals died from infectious diseases, including leprosy, typhoid fever, and tuberculosis [1].

## Social inequality and urban health

The excavation of the two burial grounds revealed clear health disparities linked to social status [1]. One cemetery, situated beneath the current public library, served merchant elites residing along Kaupmannastretet, whose diverse diets regularly included seafood [1]. In contrast, the cemetery at Søndre gate 4, located on the urban periphery and used by craft workers, showed significantly poorer general health and higher child mortality [1].

## Sources

1. [norwegianscitechnews.com](https://norwegianscitechnews.com/2026/11/the-introduction-of-a-medieval-public-health-system-exposed-the-population-to-roundworm/)
2. [scinexx](https://www.scinexx.de/news/archaeologie/mittelalterliche-stadthygiene-hat-die-verbreitung-von-spulwuermern-beguenstigt)

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Source: RealTech, realtech.media — https://realtech.media/news/rt-222184cb4bf0058c86a4a522_ntnu_researchers_find/