Negative feedback occurs when a system's output acts to reduce or dampen the processes that lead to the output of that system, resulting in less output. In general, negative feedback loops allow systems to self-stabilize. Negative feedback is a vital control mechanism for the body's homeostasis.
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ICD-10 code Z21 for Asymptomatic human immunodeficiency virus [HIV] infection status is a medical classification as listed by WHO under the range - Factors influencing health status and contact with health services .