Calvert poms-global-update
- 3. } 2008 First mortality event caused by OHsV-1uVar Wide spread mortality (50 – 90%) and farmers spread the virus to all parts of Europe through stock & equipment translocation } 2009 saw further small infection to England & Ireland. France mortality still high but not as severe as 2008 } 2010 varying rates of infection similar to 2009 with 40 – 80% } 2011 similar results to 2009 & 2010, virus appears to have taken up residency } 2012 outbreaks of POMS reported in France and England in early August. Volumes of mortality yet to be confirmed
- 4. } Early 2010, mortality event infecting much of the North Island. Mortality up to 80+% in some bays. } Late 2010 saw a new round of mortality events but not as severe as earlier in the year. } 2010 POMS detected in the South Island but no mortalities. The fact that the virus has not materialised into mortalities is assumed due to the cooler water temperatures compared to the North Island } 2011 saw smaller infection rates and mortalities were lower than 2010
- 5. } 2010 – Large mortality event in Georges River NSW. Death rate of 90+% of all farmed & wild Pacific Oysters. Further deaths confirmed in Sydney Harbour } 2011 – a second wave of POMS but over 2 or 3 events. Inconsistency possibly caused by a wet year with varying water temperatures & salinity. } 2012 - ??
- 6. } Reports emerging of slightly different version of POMS strain found in Japan. Mortality rates are unknown as information is being well controlled by government. } Growers in Hiroshima Bay (Japan’s largest producing region) are not seeing any mortality events } Very little communication from Asia in relation to POMS
- 7. } Australian delegation to France heard from IFREMER that New Zealand frozen samples stored from 2006 had shown positive tests to POMS. } New Zealand confirmed that frozen samples stored from 2005 also had positive tests to POMS, but no mortalities until 2010 } New Zealand had un-explained mass mortality event in late 1990’s. POMS virus was unknown at that time } There is growing evidence that POMS is not passed on through vertical transmission, more likely horizontal
- 8. } Needs water temperature over 17°c to trigger virus } The most efficient way to spread the virus is through stock & equipment translocation from infected bays } 2011 & 2012 testing program has found no POMS in TAS & SA