First insights into transmission dynamics of the ostreid herpervirus 1 (OsHV-1) between Pacific oysters, Crassostrea gigas, using experimental infection data
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1
Ifremer, France
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2
INRA, LUNAM Université, Oniris, France
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3
Ifremer, France
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4
Ifremer, France
Since 1990s, mass mortalities have been reported in France in spat of Pacific oysters, Crassostrea gigas. Since 2008, increased mortality events have been observed, in association with the detection of a particular ostreid herpesvirus type-1 (OsHV-1) genotype (µVar). However, even though this pathogen and its host immunity response are studied by different groups, data on this viral disease and its transmission within populations is very sparse.
We have built the first mathematical model to estimate the transmission parameters of OsHV-1 infection among oysters, under simulated laboratory conditions. Using a protocol of infection based on injection of a viral suspension to non-infected oysters and individual recording up to 7 days, we considered different parameters: pathogen stability (capacity to induce an infection) in water, latency, and infectious and persistence periods, virus shedding rate and LD50. Their estimations are here presented. Fitted to dedicated experimental infection data, the model describes development of the viral disease within a small and closed population under constant environmental factors (Figure 1). Such information can help to identify key transmission parameters to better estimate by further dedicated studies, in order to help to assess the rate of spread of OsHV-1 and its potential to persist in oyster populations.
Keywords:
OsHV-1,
Oyster disease,
disease modeling,
Small Population,
Disease Transmission, Infectious
Conference:
AquaEpi I - 2016, Oslo, Norway, 20 Sep - 22 Sep, 2016.
Presentation Type:
Poster
Topic:
Aquatic Animal Epidemiology
Citation:
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(2016). First insights into transmission dynamics of the ostreid herpervirus 1 (OsHV-1) between Pacific oysters, Crassostrea gigas, using experimental infection data.
Front. Vet. Sci.
Conference Abstract:
AquaEpi I - 2016.
doi: 10.3389/conf.FVETS.2016.02.00010
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Received:
16 Aug 2016;
Published Online:
14 Sep 2016.
*
Correspondence:
DVM, PhD. Coralie LUPO, Ifremer, La Tremblade, 17390, France, epidemiologiste@respe.net