The London hotel at the centre of a stomach bug affecting athletes at the World Championships says it is not the source of the illness.
The Irish team are staying at the Tower Hotel, where 28 guests have contracted gastroenteritis.
A spokesman for the Tower Hotel says it has followed "strict hygiene protocol" and claim those affected aren't in contact with other guests.
Ireland's Thomas Barr missed the 400 metres hurdles semi-finals after contracting the vomiting bug.
The hotel said: “We can confirm that regretfully a small number of our guests have been suffering from an illness. We have worked collaboratively with the EHO (Environmental Health Officer) and IAAF to investigate the origins of the illness and can confirm that the hotel was not the source of the illness.
“We have followed strict hygiene protocol, ensuring that those affected are not in contact with other guests and all public areas have been thoroughly sanitised.
"We continue to liaise with the medical authorities and the IAAF to ensure the comfort of those guests affected and the health and well-being of all our guests remains a priority.”
Botswana's Isaac Makwala was also struck down with the bug but given medical dispensation to withdraw from the 200m heats on Monday night.
