Abstract
Ostreid herpesvirus type 1 replication and host response in adult Pacific oysters, Crassostrea gigas
Highlights
In 1972, virus particles morphologically similar to herpesviruses were first reported in an invertebrate, the Eastern oyster, Crassostrea virginica, from the USA [1]
No mortality was observed in control adult oysters, viral DNA was detected by real-time PCR in animals from both families (A1 and A2) (Figure 2)
As Pacific oysters do not show macroscopic symptoms before dying during the course of ostreid herpesvirus type 1 (OsHV-1) infection, it remains difficult in the absence of mortality reports to know whether adults are susceptible to infection
Summary
In 1972, virus particles morphologically similar to herpesviruses were first reported in an invertebrate, the Eastern oyster, Crassostrea virginica, from the USA [1]. OsHV-1 is reported in mass mortality outbreaks observed among Pacific oysters less than one year old [5,6,7,8]. Considering the economic importance of shellfish culture, tools have been previously developed for rapid virus detection [5,9,10,11,12] and the OsHV-1 genome has been fully sequenced from purified virus particles [3]. Since 2008, mass mortality outbreaks (with rates of up to 80%) were reported in C. gigas spat and juveniles in Europe, New Zealand and Australia [13,14,15] and were associated with virus variants [16,17,18]. The role of OsHV-1 in these mortalities has been underlined by experimental
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