Health officials say raw oysters imported from Korea are the likeliest source of a gastroenteritis outbreak among corporate patrons at the All Blacks-Ireland test at Eden Park.
Although the Auckland Regional Public Health Service investigation has yet to be completed, testing has confirmed norovirus to be the cause of illness among patrons at the match.
Of 407 people interviewed, 81 have reported being ill. The Hall of Legends hospitality area had the highest sickness rate of all four corporate areas affected on the night of June 17.
The health service said those who dined there and fell ill were 27 times more likely to have consumed raw oysters.
Salmon also has been connected to those sick, but oysters were served with the salmon.
Tests by the Institute of Environmental and Scientific Research have found norovirus in raw imported Korean oysters from the same production batches as those consumed at Eden Park.
New Zealand-grown oysters from two suppliers consumed at the event tested negative for norovirus.
Eden Park Trust Board general manager Murray Reade said it had spoken to the caterer, Michael O'Brien Catering, but wanted to wait until the public health service completed its investigation before any decisions.
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