British health authorities have confirmed that seven hotel staff have tested positive for a minor exposure to polonium-210, the radioactive substance found in Litvinenko's body.
One of the Russians that Litvinenko met at the hotel, Dmitry Kovtun, has also shown symptoms of radioactive contamination, as has another Russian whom Litvinenko met, Andrei Lugovoi.
Litvinenko, who died in London on November 23, was buried on December 7.
(compiled from agency reports)