According to Dr. Zach Bush, the human microbiome is complex and highly variable. An adult human typically has around 10 trillion human cells and about ten times as many non-human cells as human cells. The human microbiome also includes about100 trillion bacterial cells; and 1.5 billion Parasites; 124 trillion Fungi; 14 quadrillion Mitochondra cells; and uncountable numbers of viruses.
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