Popular Article:

Gut Bacteria Can Fluctuate With the Seasons.

Zimmer, Carl.  2017.  “Gut Bacteria Can Fluctuate With the Seasons.” The New York Times (August 24).  Accessed September 4, 2017.

Primary Source:

Seasonal Cycling in the Gut Microbiome of the Hadza Hunter-Gatherers of Tanzania

Smits Samuel, Jeff Leach, Erica Sonnenburg, Zarlos Gonzalez, Joshua Lichtman, Gregor Reid, and Rob Knight. 2017.  “Seasonal Cycling in the Gut Microbiome of the Hadza Hunter-Gatherers of Tanzania.” Science 357, no. 6353 (August): 802-806.