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Table 2 OsHV-1 PCR results (# of samples and %) according to the presence or absence of moribund oysters in the diagnosed sample and the onset of mortality.

From: Ostreid herpesvirus 1 detection and relationship with Crassostrea gigas spat mortality in France between 1998 and 2006

OsHV-1 PCR results Diagnosed sample Onset of mortality
  Presence of moribund oysters Absence of moribund oysters Less than one week Greater than one week
Positive 78-70% 36-7% 74-52% 19-16%
Negative 34-30% 472-93% 67-48% 102-84%
Total 112 508 141 121