Three days into their holiday in October, Ashley fell ill with symptoms including stomach pain, diarrhoea, vomiting, fever and extreme lethargy, Irwin Mitchell said.
The firm said it was representing the families of the six people who had died and more than 1,500 people who had fallen ill after visits to the archipelago, which is west of Mauritania and Senegal.
Emma Ashley said they booked their £3,000-plus trip with Tui, and said she reported her husband’s illness on the holiday firm’s app on 9 October.
She said she had raised concerns over the hygiene standards at the resort she stayed at on the island of Sal.
On their return, her husband’s symptoms continued for some time, his wife said.
After collapsing at home in Houghton Regis, the 55-year-old, who had diabetes, which was controlled through medication, was taken to hospital on 12 November and was confirmed dead minutes later.
His death has been referred to the coroner, Irwin Mitchell said.
