A total of eight cases of coronavirus have now been linked to a Middlesbrough pub forced to close after staff and customers contracted covid-19.
The authority has advised anyone who visited the pub from August 26 to 29 to remain vigilant and book a test if they develop symptoms, however mild.
The pub has voluntarily closed and is working closely with the council to prioritise customer and staff safety.
Importantly, a negative test does not mean someone identified as a close contact can end their isolation period early.
Middlesbrough Mayor Andy Preston said: “Cases are rising around the town so it’s vital everyone does all they can to stop the spread.
“If you have symptoms it’s irresponsible to head out. Stay at home and book a test. We all must wash our hands regularly, keep our distance from those we don’t live with and wear face coverings in shared transport or in public places like shops.
“This will help us to reduce the risk of extra restrictions coming in.”
The Apple Tree announced it was closing on Sunday due to an infected customer.
The pub had planned to reopen on Tuesday but has since confirmed it will remain closed possibly until next Tuesday after more positive tests.
The pub said both staff and customers have tested positive.
A spokeswoman for the pub said: “We have taken the risks from covid-19 very seriously and have extensive precautions in place.
“We are working closely with the council to prevent the spread of infection.”
A second Middlesbrough pub The Yellow Rose, in Linthorpe, also said on Tuesday that it was temporarily closing after a customer who visited on Sunday tested positive.
The latest figures from Public Health England on Tuesday also showed a fresh rise in coronavirus cases, with a further 28 cases reported across Teesside in 24 hours.
In Middlesbrough, the number of confirmed cases climbed by 12 to 1,107.
Covid-19 tests can be booked online or by calling 119.
The symptoms of covid-19 are a high temperature, a new, continuous cough and a loss or change to a sense of taste or smell.