domingo, 29 de abril de 2012

Dried blood spot specimens are a suitable al... [Clin Infect Dis. 2012] - PubMed - NCBI

Dried blood spot specimens are a suitable al... [Clin Infect Dis. 2012] - PubMed - NCBI

Clin Infect Dis. 2012 Apr;54(8):1187-95. Epub 2012 Mar 12.

Dried blood spot specimens are a suitable alternative sample type for HIV-1 viral load measurement and drug resistance genotyping in patients receiving first-line antiretroviral therapy.


International Laboratory Branch, Division of Global HIV/AIDS, Center for Global Health, Centers for Disease Control and Prevention, Mail Stop A-11, 1600 Clifton Rd, NE, Atlanta, GA 30333, USA.



Antiretroviral therapy (ART) is being administered in developing nations at unprecedented numbers following the World Health Organization's (WHO) development of standardized first-line drug regimens. To ensure continued efficacy of these drug regimens, WHO recommends monitoring virological responses and development of human immunodeficiency virus (HIV) drug resistance (HIVDR) in HIV-infected patients in a prospective cohort. The current study compared dried fluid spot specimens with the reference standard plasma specimens as a practical tool for viral load (VL) and HIVDR genotyping in resource-limited settings.


Dried blood spot (DBS), dried plasma spot (DPS), and plasma specimens were collected from 173 -patients receiving ART at 2 hospital sites in Abuja, Nigeria. HIV-1 VL analysis was performed using NucliSENS EasyQ HIV-1 v1.1 RUO test kits. Genotyping of the HIV-1 pol gene was performed using a broadly sensitive in-house assay.


Direct comparison of VL levels showed that DBS specimens, and not DPS specimens, gave results comparable to those of plasma specimens (P = .0619 and .0007, respectively); however, both DBS and DPS specimens had excellent correlation with plasma specimens in predicting virological failure (VL, ≥1000 copies/mL) in patients (κ = 0.78 and 0.83, respectively). Of the 18 specimens with a plasma VL ≥1000 copies/mL, HIVDR genotyping rates were 100% in DBS and 38.9% in DPS specimens, and DBS specimens identified 61 of 65 HIVDR mutations (93.8%) identified in plasma specimens.


Our results indicate that DBS specimens could be used for surveys to monitor HIVDR prevention failure in resource-limited settings.
[PubMed - in process]

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