By Richard Galpin
BBC News, Moscow
The health authorities in Ireland say former Russian Prime Minister Yegor Gaidar has not been the victim of radiation poisoning.
Mr Gaidar was rushed to intensive care after collapsing in Dublin
Mr Gaidar fell ill while attending a conference in Dublin last week.
His daughter, Maria, said this week she believed her father had been the target of a political poisoning linked to the case of Alexander Litvinenko.
Mr Litvinenko, a former Russian spy, died in London after being poisoned with radioactive element polonium-210.
Although radiation has now been ruled out as a cause for Mr Gaidar's mysterious illness, his spokesman, Valery Natarov, told the BBC they were still waiting for the results of further tests carried out by doctors here in Moscow.
Mr Natarov and members of Mr Gaidar's family remain concerned that he was contaminated by "an unnatural product," as they put it.
They say there was sudden disruption to all his vital bodily functions which has not been explained so far.
They expect the Russian doctors to announce their conclusions on Monday.
Since flying back to Moscow, Mr Gaidar has apparently made a good recovery and could be released from hospital soon.
The British embassy in Moscow issued a statement saying it believed there was no link between Mr Gaidar's case and that of Mr. Litvinenko.
Mr Gaidar's daughter, Maria, was quick to make the connection and claim her father had been poisoned by people seeking to destabilise Russia.
When pushed to define who she meant she said elements within the Russian security services and opponents of the government who are now living in exile abroad.
Much now depends on the conclusions of the Russian doctors.