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.
Emergency Physician, Educator, Researcher, interested in the microbiome, evolution, and medicine