There are now 24 confirmed cases of COVID-19 related to the World Hereford Conference held in Queenstown.
Around 400 delegates from around the world including Europe, South America, USA, England and Australia were at the event, which was held from March 9th-13th.
Attendees were told to self-isolate after four initially tested positive for COVID-19 .
The conference has now been classified as a COVID-19 cluster by the Ministry of Health.
Latest figures from the Ministry of Health show 58 new confirmed and probable cases of COVID-19 nationally, bringing New Zealand's case total to 647.
Of the 647 cases, 24 are connected to the World Hereford Conference, including five from the past 24 hours.
Ministry of Health's Director-General of Health Dr Ashley Bloomfield said earlier that attendees had been contacted.
"Close contacts of those cases are being asked to self isolate and other attendees at the conference are now considered as close contacts in a precautionary way and they have also been contacted and required to self isolate for 14 days, since they were in contact with people who were at that conference," said Dr Bloomfield.
The Southern District Health Board has also been carrying out the tracking and tracing work with support from the Ministry of Health.
While the conference was based in Queenstown, delegates also visited two stud farms in Central Otago as well as the Wanaka A&P Show.