Question

which of the following statements is true regarding the human microbiome?
most bacteria do not cause disease in humans.
human cells vastly outnumber microbial cells in the body.
the human microbiome must be controlled to avoid disease.
the human microbiome is established before birth.

Explanation:

• Microbial cells in the human body outnumber human cells, so the second option is false.
• The human microbiome includes beneficial microbes that support digestion, immunity, etc., and does not need constant control to prevent disease, making the third option false.
• The human microbiome is established during and after birth, not before, so the fourth option is false.
• The vast majority of bacteria in the human microbiome are commensal or beneficial, not pathogenic.

Answer:

A. Most bacteria do not cause disease in humans.