Mark Adam said testing was helping experts understand the virus and identify asymptomatic cases.
The latest government figures show that on 15 February, Middlesbrough's infection rate was 295.8 cases per 100,000 people, the second highest rate in England.The rate peaked at 676 on 5 January.Mr Adam, the South Tees joint director of public health, said there had been "a really encouraging response and I urge people from the specified areas to come forward".
Middlesbrough Mayor Andy Preston said people had attended "in their droves" despite it being "bitterly cold last weekend", adding: "Thanks to all of them."Follow BBC North East & Cumbria on
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