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The surveillance and control programme for Bonamiosis and Marteiliosis in European flat oysters (Ostrea edulis L.) and the blue mussel (Mytilus edul...

Medhus A, Lyngstad TM, Hellberg H. The surveillance and control programme for Bonamiosis and Marteiliosis in European flat oysters (Ostrea edulis L.) and the blue mussel (Mytilus edulis L.) in Norway 2012. Surveillance and control programmes for terrestrial and aquatic animals in Norway. Annual report 2012. Oslo: Norwegian Veterinary Institute 2013

Marteilia sp and Bonamia sp were not observed in samples tested in 2012. 

The aim of the programme is to document the health status of Norwegian flat oysters regarding Bonamia ostreae and Marteilia refringens and blue mussels regarding M. refringens.

The protozoan parasites Bonamia ostreae and Marteilia refringens have been identified as the main threats to commercial flat oyster production in Europe, and bonamiosis and marteiliosis are classified as List II diseases by the European Union.

In 2004 Norway was recognized as an approved zone with regard to B. ostreae and M. refringens. Bonamia ostreae was detected in samples from a wild flat oyster population in Arendal in 2008. The Norwegian Food Safety Authority (NFSA) established a control zone to prevent further spread of the pathogen (4). Results indicated that the prevalence and intensity of infection was very low, and increased mortality has not been reported. The blue mussel is also a susceptible species for marteiliosis and the parasite has been detected in these mussels in Sweden. Blue mussels were therefore included in the Norwegian surveillance programme in 2010. 

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