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<jats:p>Intestinal helminth parasites (worms) have afflicted humans throughout history and their eggs are readily detected in archaeological deposits including at locations where intestinal parasites are no longer considered endemic (e.g. the UK). Parasites provide valuable archaeological insights into historical health, sanitation, hygiene, dietary and culinary practices, as well as other factors. Differences in the prevalence of helminths over time may help us understand factors that affected the rate of infection of these parasites in past populations. While communal deposits often contain relatively high numbers of parasite eggs, these cannot be used to calculate prevalence rates, which are a key epidemiological measure of infection. The prevalence of intestinal helminths was investigated through time in England, based on analysis of 464 human burials from 17 sites, dating from the Prehistoric to Industrial periods. Eggs from two faecal-oral transmitted nematodes (<jats:italic>Ascaris</jats:italic> sp. and <jats:italic>Trichuris</jats:italic> sp.) and the food-derived cestodes (<jats:italic>Taenia</jats:italic> spp. and <jats:italic>Diphyllobothrium latum</jats:italic> syn <jats:italic>Dibothriocephalus latus</jats:italic>) were identified, although only <jats:italic>Ascaris</jats:italic> was detected at a high frequency. The changing prevalence of nematode infections can be attributed to changes in effective sanitation or other factors that affect these faecal-oral transmitted parasites and the presence of cestode infections reflect dietary and culinary preferences. These results indicate that the impact of helminth infections on past populations varied over time, and that some locations witnessed a dramatic reduction in parasite prevalence during the industrial era (18<jats:sup>th</jats:sup>-19<jats:sup>th</jats:sup> century), whereas other locations continued to experience high prevalence levels. The factors underlying these reductions and the variation in prevalence provide a key historical context for modern anthelmintic programs.</jats:p>

Original publication

DOI

10.1371/journal.pntd.0010312

Type

Journal article

Journal

PLOS Neglected Tropical Diseases

Publisher

Public Library of Science (PLoS)

Publication Date

21/04/2022

Volume

16

Pages

e0010312 - e0010312