On Friday, the Ministry of Health said there was not a location of interest listed for the Energy Events Centre in Rotorua, relating to the Big Sing event.
A 25-year-old teacher from Avondale College tested positive on Tuesday after her flatmate contracted the virus from a co-worker.
The teacher was at school for two days last week and on Monday this week when she was infectious.
Cadenza co-ordinator Elizabeth Pilaar, from Rotorua, said the Ministry of Health had advised those at the two-day event to get tested if symptoms developed.
"They do not want all 12 choirs - all 350 students - to go and get tested. But because everyone is in level 4 - and effectively at home doing the right thing - that should limit the spread," she said.
"But basically to keep a track of any symptoms - and if they do develop to get tested."
New Zealand Choral Federation chief executive Christine Argyle was staying in contact with Avondale College's choir conductor, Pilaar said.
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