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A person, who may be unaware of the infection, is highly infectious during this time yet may test negative for HIV using tests that detect anti-HIV antibodies only. Although Nucleic Acid Amplification Testing NAAT is more expensive and can take a week for processing, some have argued that it may still be a preferred way to screen for HIV. [3]
Nucleic-acid-based tests amplify and detect one or more of several target sequences located in specific HIV genes, such as HIV-I GAG, HIV-II GAG, HIV-env, or the HIV-pol. [33] [34] Since these tests are relatively expensive, the blood is screened by first pooling some 8–24 samples and testing these together; if the pool tests positive, each ...
Rotavirus. A nucleic acid test (NAT) is a technique used to detect a particular nucleic acid sequence and thus usually to detect and identify a particular species or subspecies of organism, often a virus or bacterium that acts as a pathogen in blood, tissue, urine, etc. NATs differ from other tests in that they detect genetic materials (RNA or DNA) rather than antigens or antibodies.
[30] [31] [32] One week later, Cepheid and Danaher announced a 20% price reduction for their Xpert MTB/RIF TB test cartridge, from $9.98 to $7.97 in high TB-burden countries. However, their Xpert MTB/XDR test used to diagnose for drug-resistant TB, which is the deadliest form, remained unchanged at $14.90. [33] [34]
A 2010 review study by Puren et al. [2] 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.
In the past nucleic acid tests have mainly been used as a secondary test to confirm positive serological results. [3] However, as they become cheaper and more automated, they are increasingly becoming the primary tool for diagnostics and can also be use for monitoring of treatment of viral infected individuals t.
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