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Radioscopy laboratory diagnostic of epizootic diseases in Belgium and European countries

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Academic year: 2021

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CODA CERVA

Veterinary and Agrochemical Research Center - Groeselenberg ,99 B-1180 BRUSSELS

phone : +32(0)2 379 04 00 www.var.fgov.be

CODA CERVA

Veterinary and Agrochemical Research Center - Groeselenberg, 99 B-1180 BRUSSELS

BELGIUM phone : +32(0)2 379 04 00 www.coda-cerva.be

Radioscopy laboratory diagnostic of epizootic

diseases in Belgium and European countries

Introduction

Belgium and other European neighbouring countries faced several emerging and re-emerging diseases as well as zoonotic diseases over the last decade. However, it has been noticed that during these episodes adequate laboratory diagnostic capabilities were the clue to rapidly control and eradicate these diseases. An updated crisis scenario book, as it is implemented in the Belgian national laboratory (NRL), has showed all its usefulness during these situations.

Belgium plays a key role in international animal trade making it very sensitive to disease introduction via different pathways e.g. trade of live animals or animal products from around the world or via wildlife (translocation). It is therefore crucial to react quickly to these diseases, to establish appropriate contingency plans and to develop reliable diagnostic tests. Moreover, only few publications regarding the increase of diagnostic capacities are available in the scientific literature.

1

2 Faculty of Veterinary Medicine, Research Unit in Epidemiology and risk analysis applied to

veterinary sciences (UREAR-ULg), Faculty of Veterinary Medicine, B-4000 LIEGE BELGIUM

Materials and methods

Based on 29 selected diseases (Bianchini J., personal communication), a mapping of existing techniques was created. An overview of

assays available and which would be used in different scenarios (risk importation, early detection, spread and freedom of disease) in

national and international laboratories was established. If gaps were detected, international laboratories were contacted in order to create future partnerships. These data were completed by the analysis of the World Animal Health Information System (WAHIS) online tools of the World Organization for Animal diseases (OIE) for the 40 major European countries (possibilities and assays used) encoded for 23 of the 29 diseases included in the OIE list.

Results and perspectives

Frequency of the different assays used in the Belgian laboratories (fig. 2a) and in Europe (fig. 2b)

to detect the selected diseases

These surveys have showed that virus isolation and virus neutralization test are sensitive and specific and are therefore often considered as gold standard confirmation tests. However, they are slow, laborious and require biosafety laboratory facilities. For many diseases, enzyme-linked immunosorbent assays (ELISA) are often used and commercially available. Although its rapidity, often good sensitivity and specificity, ELISA needs to be standardized and fit for purpose which requires training and experience. Molecular methods such as the polymerase chain reaction (PCR or mostly real-time PCR) are very specific and sensitive which give qualitative and/or quantitative result in a few hours but need adequate material (e.g. good extraction protocol). In addition, PCR’s are very often sequence-dependent and thus sensitive to mutations and contaminations which can lead to false negative results. Sequencing offers promising solutions but is currently only used as confirmation for first suspicious samples and is still restrained for research purposes because of the price for the equipment, the samples preparation and the requirement for trained staff.

On the other hand, this project suggests the importance of implementing, keeping up-to-dated online data at European level for (re-)emerging diseases, especially for Cache valley virus, Aino disease, Nipah disease, Porcine deltacoronavirus.

In conclusion, it was showed that Belgium is able to establish a diagnostic for 25 of the 29 of targeted diseases and underlined the importance of collaboration between laboratories permitting Belgium to have the diagnostic capacities to face all situations mentioned in the scenarios.

This work will help the Veterinary Authorities to take a faster, precise and well documented

decision in case of an epidemic in Belgium.

This study was funded by the Federal Public Service of Health, Food Chain Safety and Environment (contract RT 13/3 EPIDIACAP)

Using LimeSurvey® web application and the WAHIS online tools, a large survey in Belgium and in Europe has been completed to implement a specific database and to determine laboratory capacities in Europe. Using four scenario analyses (risk of importation, early detection, spread and freedom of disease) diagnostic flow charts and questions, concerning kits characteristics (e.g. sensibility & specificity), as well as additional questions regarding laboratory capacities, the experience and the degree of accreditation were asked. All data were gathered online in decision trees using Cmap® software. Also bilateral partnerships (techniques and/or collaboration

protocols) between Belgian NRL and other European institutions will be developed

.

3 19 1 1 1 4

Laboratoire national + 2 laboratoires régionaux Laboratoire national

Laboratoire régional 2 laboratoires régionaux

Laboratoire national + 1 laboratoire régional regional Pas de laboratoire belge

Number of diseases detected in routine in the national and regional Belgian laboratories

Sum of possibilities of detection for the 23 selected diseases in the 40 European countries encoded in

WAHIS Possibilities of detection for the 29 selected diseases in 6 neighbouring countries of Belgium

30%

34% 15%

15%

4% 2%

Enzyme-Linked Immunosorbent Assays Real-Time Polymerase Chain Reaction Virus Neutralization Test

Virus isolation

Hemagglutination Inhibition Maldi-Tof

Example of a generic decision tree

0 5 10 15 20 25 30 35 40 N ip a h v iru s e n ce p h a lit is H a e m o rrh a g ic s e p tica e m ia Ja p a n e s e e n ce p h a lit is C o n ta g io u s ca p ri n e p le u ro p n e u m o n ia Ep izo o tic h a e m o rrh a g ic d is e a s e Eq u in e e n ce p h a lo m ye lit is (Ve n e zu e la n ) Eq u in e e n ce p h a lo m ye lit is (W e s te rn ) Eq u in e e n ce p h a lo m ye lit is (Ea s te rn ) R ift Va lle y F e v e r L u m p y s ki n d is e a s e Sh e e p p o x a n d g o a t p o x C o n ta g io u s b o v in e p le u ro p n e u m o n ia Pe s te d e s p e tit s ru m in a n ts Ve s icu la r s to m a tit is W e s t N ile e n ce p h a lit is Af ri ca n h o rs e s ickn e s s Sw in e v e s icu la r d is e a s e Af ri ca n s w in e f e v e r Bl u e to n g u e C la s s ica l s w in e f e v e r v iru s (h o g ch o le ra ) F o o t a n d m o u th d is e a s e Av ia n In flu e n za N e w ca s tle d is e a s e N u m b e r o f c o u n tr ie s

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