Forget the faithful hound. The animal that has been most truly loyal to humans throughout history has been that quiet freeloader, the intestinal worm – a tiny beast that has stuck with us through rich and poor, war and peace, feast and famine.
, this parasite is a common form of infection, making itself at home in around a billion people's guts and putting the growth and development of young children at risk.
Roman and High Medieval periods were both glory days for roundworms and whipworms all over the land, it seems, with infections peaking in late medieval times. With London's citizens being an exception, many in the UK seemed to benefit from the revolution in sanitation that took place in the 18th and 19th centuries. The numbers of infected varied considerably from place to place, suggesting some measures were having a profound effect on parasite movement.Flatworm infestations provided insights into the culinary habits of populations throughout history.
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