Article (Scientific journals)
Formal estimation of the seropositivity cut-off of the hemagglutination inhibition assay in field diagnosis of influenza D virus in cattle and estimation of the associated true prevalence in Morocco.
Saegerman, Claude; Salem, Elias; Ait Lbacha, Hicham et al.
2020In Transboundary and Emerging Diseases
Peer Reviewed verified by ORBi
 

Files


Full Text
IDV_TBED_13805_Published.pdf
Publisher postprint (865.41 kB)
Download

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
cattle; epidemiology; hemagglutination inhibition assay; influenza; respiratory; sensitivity; specificity; surveillance; virus
Abstract :
[en] The influenza D virus (IDV) was discovered less than ten years ago. Increased interest in this virus is due to its nature (RNA virus with high mutation rate), its worldwide circulation in livestock species, its probable role in bovine respiratory disease and its zoonotic potential. Until currently, the establishment of positivity cut-off of the hemagglutination inhibition (HI) assay was not formalized in field conditions for the detection of antibodies directed against IDV in cattle (i.e. the proposed reservoir). In this study, the positivity cut-off of the HI assays was formally established (titre = 10) using a receiver operating characteristic (ROC) curve. This information was used to estimate the sensitivity (68.04 to 73.20%) and the specificity (94.17 to 96.12%) of two different HI assays (HI(1) and HI(2) , with two different IDV antigens) relatively to virus micro-neutralization test (VNT) as reference test. Based on the above characteristics, the true prevalence of IDV was then estimated in Morocco using a stochastic approach. Irrespective of the HI assays used, the estimation of the true prevalence was statistically equivalent (between 48.44% and 48.73%). In addition, the Spearman rank correlation between HI titres and VNT titres was statistically good (0.76 and 0.81 for HA(1) and HA(2) , respectively). The positive (0.82 and 0.79 for HA(1) and HA(2) , respectively) and the negative (0.86 and 0.85 for HA(1) and HA(2) , respectively) agreement indices between results of HI assays and VNT were good and similar. This study allowed for a formal establishment of a positivity cut-off in HI assays for the detection of antibodies directed against IDV. This information is of prime importance to estimate the diagnostic sensitivity and specificity of the test relatively to the VNT (i.e. the reference test). Using these characteristics, the true prevalence of IDV should be determined in a country.
Disciplines :
Veterinary medicine & animal health
Author, co-author :
Saegerman, Claude  ;  Université de Liège - ULiège > Département des maladies infectieuses et parasitaires (DMI) > Epidémiologie et analyse des risques appl. aux sc. vétér.
Salem, Elias
Ait Lbacha, Hicham
Alali, Said
Zouagui, Zaid
Meyer, Gilles
Ducatez, Mariette F.
Language :
English
Title :
Formal estimation of the seropositivity cut-off of the hemagglutination inhibition assay in field diagnosis of influenza D virus in cattle and estimation of the associated true prevalence in Morocco.
Publication date :
2020
Journal title :
Transboundary and Emerging Diseases
ISSN :
1865-1674
eISSN :
1865-1682
Publisher :
Wiley, Berlin, Germany
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
© 2020 Wiley-VCH GmbH.
Available on ORBi :
since 11 September 2020

Statistics


Number of views
82 (2 by ULiège)
Number of downloads
199 (1 by ULiège)

Scopus citations®
 
3
Scopus citations®
without self-citations
1
OpenCitations
 
4

Bibliography


Similar publications



Contact ORBi