Cook agent Susan Cooper and her husband John, from Burnley, fell fatally ill at the Steigenberger Aqua Magic hotel in Hurghada on August 21.
The Egyptian authorities reported last week the couple died after contracting E. coli.
Thomas Cook’s own independent tests of the food, water and air conditioning at the hotel found a “high level of E. coli and staphylococcus bacteria”, a common cause of food poisoning.