Species Numbers in Bacteria
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3160642/

NIH Human Microbiome Project defines normal bacterial makeup of the body
https://www.nih.gov/news-events/news-releases/nih-human-microbiome-project-defines-normal-bacterial-makeup-body

Your Microbes and You The Good, Bad and Ugly
https://newsinhealth.nih.gov/2012/11/your-microbes-you

Are Viruses Alive?
https://www.scientificamerican.com/article/are-viruses-alive-2004/

Viruses: You've heard the bad; here's the good
https://www.sciencedaily.com/releases/2015/04/150430170750.htm

Our complicated relationship with viruses
https://www.sciencedaily.com/releases/2016/11/161128151050.htm