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Home >> Publications >> Hepatitis B viral load in dried blood spots: A validation study in Zambia.

Publication

Author(s):

Vinikoor MJ, Zürcher S, Musukuma K, Kachuwaire O, Rauch A, Chi BH, Gorgievski M, Zwahlen M, Wandeler G.

Pub Title:

Hepatitis B viral load in dried blood spots: A validation study in Zambia.

Pub Date:

Nov 1 2015

Pub Region(s):

Southern Africa

Journal:

Title: 
Journal of Clinical Virology

PubMed: 26356987
BACKGROUND:
Access to hepatitis B viral load (VL) testing is poor in sub-Saharan Africa (SSA) due to economic and logistical reasons.
OBJECTIVES:
To demonstrate the feasibility of testing dried blood spots (DBS) for hepatitis B virus (HBV) VL in a laboratory in Lusaka, Zambia, and to compare HBV VLs between DBS and plasma samples.
STUDY DESIGN:
Paired plasma and DBS samples from HIV-HBV co-infected Zambian adults were analyzed for HBV VL using the COBAS AmpliPrep/COBAS TaqMan HBV test (Version 2.0) and for HBV genotype by direct sequencing. We used Bland-Altman analysis to compare VLs between sample types and by genotype. Logistic regression analysis was conducted to assess the probability of an undetectable DBS result by plasma VL.
RESULTS:
Among 68 participants, median age was 34 years, 61.8% were men, and median plasma HBV VL was 3.98logIU/ml (interquartile range, 2.04-5.95). Among sequenced viruses, 28 were genotype A1 and 27 were genotype E. Bland-Altman plots suggested strong agreement between DBS and plasma VLs. DBS VLs were on average 1.59logIU/ml lower than plasma with 95% limits of agreement of -2.40 to -0.83log IU/ml. At a plasma VL ≥2,000IU/ml, the probability of an undetectable DBS result was 1.8% (95% CI: 0.5-6.6). At plasma VL ≥20,000IU/ml this probability reduced to 0.2% (95% CI: 0.03-1.7).
CONCLUSIONS:
In a Zambian laboratory, we observed strong agreement between DBS and plasma VLs and high sensitivity in DBS at plasma VL ≥2,000IU/ml. As HBV treatment expands, DBS could increase access to HBV VL testing and care in SSA settings.
Copyright © 2015. Published by Elsevier B.V.
KEYWORDS:
Africa; Dried blood spots; HIV/AIDS; Hepatitis B virus; Viral load

 

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Citation:

Vinikoor MJ, Zürcher S, Musukuma K, Kachuwaire O, Rauch A, Chi BH, Gorgievski M, Zwahlen M, Wandeler G. Hepatitis B viral load in dried blood spots: A validation study in Zambia. J Clin Virol. 2015 Nov;72:20-4. doi: 10.1016/j.jcv.2015.08.019. Epub 2015 Sep 3. PubMed PMID: 26356987.