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Analysis of 3rd Century AD Sewage at a Roman Fort Near Hadrian’s Wall Identified Infections by Roundworms, Whipworms, and Giardia Duodenalis, Revealing How Sanitation Failures Directly Affected the Health, Physical Fitness, and Operational Capacity of Roman Soldiers Stationed on the Northern Frontier of the Roman Empire.
Roman soldiers occupying the Roman fort of Vindolanda in northern Britannia faced intestinal diseases caused by poor sanitation, according to an analysis of 3rd-century AD sewage that identified three parasites, including the first confirmed evidence of Giardia duodenalis in Roman Britain, with direct effects on military fitness.
The Roman Fortress and the Strategic Role of the Northern Frontier
Vindolanda was located near Hadrian’s Wall, a structure built in the early 2nd century AD to defend the province of Britannia against northern tribes.
The wall remained in use until the end of the 4th century and stretched from the North Sea to the Irish Sea, forming a continuous defensive line along the northern frontier of the Roman Empire.
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The system included forts and towers erected at regular intervals, manned by infantry, archers, and cavalry units recruited from different regions of the empire.
The fort of Vindolanda is situated between Carlisle and Corbridge in present-day Northumberland, UK, and served as an advanced military surveillance and control point.
In addition to its defensive function, the site housed essential structures for the daily life of Roman soldiers, such as baths, communal latrines, and drainage systems connected to nearby watercourses.
Exceptional Preservation and Remnants of Roman Daily Life
Vindolanda is known for the unusual preservation of organic materials due to the constantly waterlogged soil, a condition that reduced decomposition over the centuries.
Archaeological excavations uncovered over 1,000 thin wooden tablets used for writing, which record administrative and personal aspects of life at the fortress.
The site also provided over 5,000 leather Roman shoes, offering direct evidence of clothing, logistics, and living conditions of the occupants.
These findings established Vindolanda as one of the most informative sites for studying military daily life in the northern frontier of Britannia.
The preservation of the site also allowed for detailed analyses of sanitation infrastructures, critical for understanding the health and diseases affecting the soldiers.
Methodology for Analyzing 3rd Century AD Sewage
The study focused on sediments collected from a sewage system linked to a latrine block of a 3rd-century AD bath complex within the fort.
Fifty samples were analyzed from a drainage channel approximately nine meters long, responsible for transporting waste to a stream north of the fortress.
During the excavation of the channel, archaeologists recovered Roman beads, ceramic fragments, and animal bones, indicating varied discards alongside human waste.
The samples were divided between laboratories at the University of Cambridge and the University of Oxford, where they underwent detailed microscopic analyses.
Researchers sought ancient helminth eggs, a group of parasitic worms capable of infecting humans and other animals, preserved in the sewage sediments.
Identified Parasites and the First Evidence of Giardia
About 28% of the analyzed samples contained eggs of roundworms or whipworms, intestinal parasites transmitted via fecal-oral routes in environments with inadequate sanitation.
One of the samples showed eggs of both species simultaneously, indicating multiple infections among users of the communal latrine of the bath complex.
This same sample was subsequently subjected to a molecular ELISA test, capable of detecting proteins produced by unicellular organisms.
The test revealed the presence of Giardia duodenalis, a microscopic protozoan associated with diarrheal outbreaks and primarily transmitted through contaminated water.
This discovery represents the first confirmed evidence of Giardia duodenalis in Britain during the Roman period.
The identified roundworms can reach between 20 and 30 cm in length, while whipworms grow to about 5 cm, sizes consistent with chronic infections.
Oldest Evidence and Continuity of Infections
The team also examined sediments associated with an earlier fort located at the same archaeological site, dating from the 1st century AD.
This fort was built around 85 AD and abandoned between 91 and 92 AD, prior to the consolidation of the later structures of Vindolanda.
The analyzed sample was collected from a ditch that was part of the defensive system of this older fort and contained roundworm and whipworm eggs.
The results indicate that parasitic infections were present from the earliest periods of Roman military occupation at the site.
This continuity suggests that later structural improvements, such as latrines and sewage systems, did not eliminate the sanitary risks faced by soldiers.
Impacts of Infections on Health and Military Fitness
According to Dr. Marissa Ledger, who led the study conducted in Cambridge, the three identified parasites could cause malnutrition and recurring episodes of diarrhea.
Although the Romans were aware of the existence of intestinal worms, their physicians had few resources to eliminate infections or alleviate symptoms.
Chronic infections could persist and worsen, weakening Roman soldiers over time and reducing their capacity for military service.
The helminths alone can cause nausea, abdominal cramps, and diarrhea, directly affecting the physical performance of those infected.
Dr. Piers Mitchell noted that giardiasis could have caused severe illnesses during the warmer months, when outbreaks linked to contaminated water tend to intensify.
Untreated infections can last for weeks, leading to extreme fatigue, weight loss, and dehydration, with collective impacts on the garrison.
Mitchell also noted that the presence of these fecal-oral parasites indicates favorable conditions for other intestinal pathogens, such as Salmonella and Shigella.
Comparison with Other Roman Military Sites
The researchers state that the pattern observed at Vindolanda is similar to that identified at other European Roman military sites.
Comparable cases have been documented in Carnuntum, present-day Austria, in Valkenburg along the Rhine in the Netherlands, and in Bearsden, Scotland.
At these military locations, fecal-oral transmitted parasites predominated, associated with communal environments and limited sanitation infrastructure.
In contrast, large Roman urban centers like London and York show greater diversity of parasites, including those transmitted by fish and meat.
According to Dr. Patrik Flammer, the existence of communal latrines and sewage systems in Vindolanda did not prevent transmission among soldiers.
The shared use of these facilities may have facilitated the continuous spread of infections within the fort, even with apparent infrastructure.
What Ancient Parasites Reveal About Roman Life
For Professor Adrian Smith, the study of ancient parasites allows us to understand which pathogens affected past populations and how they varied according to lifestyle.
These analyses also show how diseases changed over time and how sanitary practices influenced public health in different historical contexts.
Dr. Andrew Birley, executive director of the Vindolanda Charitable Trust, stated that the findings continue to reshape our understanding of life on the Roman northern frontier.
According to him, the excavations reveal the hardships faced by Roman soldiers stationed in this remote region nearly 2,000 years ago.
This data challenges simplified ideas about life in Roman forts, showing a daily existence marked by persistent diseases and limited sanitary conditions.
A poem by W. H. Auden mentions lice and colds faced by a Roman soldier on a rainy northern wall of Europe.
In light of new evidence, severe stomach disorders may be added to this list of adversities, expanding the portrayal of the actual conditions experienced by Roman military personnel.
This article is based on the study “Parasitic Infections at the Roman Fort of Vindolanda, by Hadrian’s Wall, UK”, by Marissa L. Ledger, Patrik G. Flammer, Adrian L. Smith, Andrew Birley, and Piers D. Mitchell, published on December 2, 2025, in the journal Parasitology (DOI: 10.1017/S0031182025101327), as well as institutional information from the Vindolanda Charitable Trust.
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