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The immune system will destroy any microorganism in the blood.

White blood cells roll around the inside of the blood vessels, patrolling for any intruders. they bump into and attack anything they don't recognize as "self" (marked as part of the body by specific proteins on the surface of all cells).

Normal micro-flora preform positive functions for the host when confined to certain areas but may be harmful in other areas. For example, the bacteria staphylococcus is a common resident of the skin and can keep harmful bacteria from colonizing the skin. However, if this bacteria enters the body it can cause a staff infection.

The blood is important since it reaches every part of the body; any microorganism could be a potential threat if it entered unhindered because it could settle down in any part of the body and cause an infection.

When an infection is in the blood it is called sepsis, this is a serious problem.

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Q: Why normal microflora are not present in blood?
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