Great news for Bluff oyster lovers with news that the biosecurity response launched in March after three wild oysters were found to be infected has found no evidence of the disease spreading to the lucrative Bluff Oyster beds. Niwa scientists have been testing more than 2000 oysters taken from 15 sites in the Foveaux Strait, to better understand the possible extent of the recent discovery and Biosecurity New Zealand spokesperson. Dr Catherine Duthie says all the results have been negative.