Forty-five cases of Covid-19 in Matamata have been linked either directly or indirectly to the Redoubt Bar.
Anyone who visited the Waikato town in the previous two weeks who was experiencing virus symptoms was told to self-isolate.
It was thought celebrations at Redoubt Bar on St Patrick's Day were where most caught the virus but it appeared transmission took place at the site in surrounding days.
Waikato District Health Board chief executive Dr Kevin Snee said anyone who had virus symptoms should self-isolate from their bubble.
"The number of cases will likely be of concern to some residents but if they are following the national guidance to remain in lockdown and stay in their 'bubble', they will be keeping themselves and their families safe, " Snee said.
The DHB was expecting the number to shift as people presented for assessment and contact tracing work continued.
Since Monday afternoon, around 200 people had been assessed in the Community Based Assessment Centre (CBAC) set up in the town by this evening.
Any Matamata residents with symptoms of Covid-19 should contact Healthline and their GP and visit the nearest CBAC.
People were instructed to inform CBAC staff if they had attended Redoubt Bar within the previous fortnight, or if they had close contact with anyone who had.