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viral load
Viral load, also known as viral burden, viral titre or viral titer, is a numerical expression of the quantity of virus in a given volume. It is often expressed as viral particles, or infectious particles per mL depending on the type of assay. A higher viral burden, titre, or viral load often correlates with the severity of an active viral infection. The quantity of virus / mL can be calculated by estimating the live amount of virus in an involved body fluid. For example, it can be given in RNA copies per millilitre of blood plasma. Tracking viral load is used to monitor therapy during chronic viral infections, and in immunocompromised patients such as those recovering from bone marrow or solid organ transplantation. Currently, routine testing is available for HIV-1, cytomegalovirus, hepatitis B virus, and hepatitis C virus.
==Technologies for viral load testing==
A recent review study by Puren ''et al.'' categorizes viral load testing into three types: (1) nucleic acid amplification based tests (NATs or NAATs) commercially available in the United States with Food and Drug Administration (FDA) approval, or on the market in the European Economic Area (EEA) with the CE marking; (2) "Home–brew" or in-house NATs; (3) non-nucleic acid-based test.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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