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Table 1 Crassostrea gigas samples collected during passive and active surveillance in France between 1998 and 2006: OsHV-1 detection results by PCR.

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

Year Passive surveillance samples Active surveillance samples
  Number of samples Number of OsHV-1 negative samples Number of OsHV-1 positive samples OsHV-1 detection frequency (%) Number of samples Number of OsHV-1 negative samples Number of OsHV-1 positive samples OsHV-1 detection frequency (%)
1998 32 29 3 9 120 110 10 8
1999 19 15 4 21 102 98 4 4
2000 38 30 8 21 48 44 4 8
2001 53 33 20 38 88 85 3 3
2002 34 12 22 65 - - - -
2003 23 12 11 48 - - - -
2004 30 19 11 37 - - - -
2005 17 7 10 59 - - - -
2006 16 12 4 25 - - - -
Total 262 169 93 35 358 337 21 6