Gardaí have launched an investigation into the possibility that the former Russian Prime Minister may have been poisoned during a visit to Dublin last week.
Dr Gaidar fell ill at a conference in Maynooth at 5.15pm last Friday. He was taken to James Connolly Memorial Hospital in Blanchardstown, Dublin. Dr Gaidar returned home at the weekend and was admitted to hospital in Moscow on Sunday.
It is understood that doctors have ruled out any form of radioactive poisoning, which killed the Russian dissident Alexander Litvinenko in London last week. They may also decline to issue a formal statement on Dr Gaidar's condition at all, since they cannot reach any conclusive diagnosis.
The garda investigation is under the control of Det Chief Supt P Kelly, of the special detective unit.
Inquiries to date have been conducted with hospital and medical staff and through the diplomatic corps, according to a statement last night.
"Public health and safety is of paramount importance and there is nothing known which indicates that any member of the public is at risk," the statement said.