Helminths and human ancestral immune ecology

What is the evidence for high helminth loads among foragers?

Douglas London, Daniel Hruschka

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Objectives: Recent theories of human immune ecology have invoked high helminth loads as an important selection factor among early humans. However, few studies have assessed this assumption among extant human foragers. Methods: We review the current evidence for high helminth loads in documented forager populations and present new data from members of a Kawymeno Waorani forager group in Amazonian Ecuador (n=16) compared with neighboring Kichwa subsistence farmers (n=63). Results: Stool samples indicated a near absence of helminths among the Kawymeno foraging group (6.25% with Ascaris lumbricoides and 0% with Ancylostoma duodenale or Trichuris trichiura). In contrast neighboring, isolated Kichwa subsistence farmers in a similar ecosystem had abundant helminth infestations (76.1% with Ascaris lumbricoides, 11.1% with Ancylostoma duodenale, and 1.5% with Trichuris trichiura). The presence of helminths among the Waorani and Kichwa was triangulated across multiple data sources, including presence in stool samples, medical exams, and 3 years of participant observation. Conclusions: These findings, coupled with the modern forager literature, raise questions as to whether helminths were prevalent enough in Paleolithic humans to be a unique evolutionary selective force in human physiology. Am. J. Hum. Biol. 26:124-129, 2014.

Original languageEnglish (US)
Pages (from-to)124-129
Number of pages6
JournalAmerican Journal of Human Biology
Volume26
Issue number2
DOIs
StatePublished - Mar 2014

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Helminths
Ecology
subsistence
helminths
ecology
farmer
social ecology
Paleolithic
Ecuador
physiology
Trichuris trichiura
participant observation
Ancylostoma
Ascaris lumbricoides
evidence
Trichuris
Group
ecosystem
present
Modern Literature

ASJC Scopus subject areas

  • Anthropology
  • Anatomy
  • Genetics
  • Ecology, Evolution, Behavior and Systematics

Cite this

Helminths and human ancestral immune ecology : What is the evidence for high helminth loads among foragers? / London, Douglas; Hruschka, Daniel.

In: American Journal of Human Biology, Vol. 26, No. 2, 03.2014, p. 124-129.

Research output: Contribution to journalArticle

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