There have now been 81 people who have taken ill after eating at the Anson Farm on Teesside Industrial Estate last month.

Of that number, 35 have tested positive for salmonella – four more since Monday.

All those who have tested positive contracted the bug before the pub put in a series of control measures requested by PHE and Stockton Council environmental health officers in the week commencing May 18, confirmed a PHE spokesperson.

Both PHE and environmental health are continuing to investigate possible sources of the outbreak.