More than 1,700 people have now joined the legal action against travel company Tui after becoming ill while on holiday in the Cape Verde islands, lawyers have told the BBC.
Lawyers from Irwin Mitchell, who are leading the personal injury claim, say they have been contacted by people who became ill there as recently as two weeks ago.
They believe at least eight Britons have now died after holidays there in recent years. In February, UK health officials warned Britons over travel to the West African archipelago following reports of stomach bugs.
Tui is investigating the claims and said it was "not in a position to provide a statement at this stage".
It said it did "not yet have access to the full Cape Verde health report, which remains unpublished".
