Here is the link to the Radiolab program on hygiene and hookworm:
Excellent NPR piece on microbiota diversity:
Here is an image from the recent Yatsunenko et al. study published in Nature this year, showing the differences between adult and infant microbiomes. Malawians take a little longer time to adopt the adult pattern of microbiota, compared to a US population (a). Infant microbiotas are significantly different from the microbiota of adults (b). CLick on the image to take you to the article.
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Joe Alcock
Emergency Physician, Educator, Researcher, interested in the microbiome, evolution, and medicine
EvolutionMedicine 
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