About two-thirds of people infected in New Zealand's Delta outbreak are younger than 30 and half come from the Pasifika community.
The new insights - which one Pacific health expert has called "depressingly familiar" - come as the outbreak rises to 210 cases.
The ministry data shows that, of 210 cases confirmed between August 17 and August 25, and which have been verified as not being linked to overseas travel, 32 cases are aged between 10 and 19 and another 14 are aged under 9.
Of the remainder, 18 are in their 30s (up from 10 yesterday), another 20 are in their 40s (up from 13 yesterday), 24 are in their 50s (up from 19 yesterday) , nine are in their 60s (unchanged since yesterday).
Fourteen cases are associated with a Massey household.
The rest of the sub-clusters are fewer than 10 people so Bloomfield would not reveal them.
Bloomfield also revealed a positive case in Warkworth, north of Auckland. Wastewater testing had found traces of Covid-19 and the case explained those results, he said.
The number of contacts of Covid-19 had increased again to 20,383 as of this morning.
About 12,700 of those people had been contacted - and 62 per cent had returned a test result.