The man, 25, and his wife flew into Moscow from the Dominican Republic on May 19 and sought medical attention after feeling ill, though he was hospitalized only on Thursday, the Federal Consumer Protection Service said.
"His wife was placed under medical observation, but no signs of the virus have been confirmed," the agency's chief, Gennady Onishchenko, told Interfax. "The man's condition is satisfactory."
Four of the infected man's relatives who had contact with him are also undergoing medical examinations, Onishchenko said.
The announcement came just two days after Onishchenko confirmed the first swine flu case in Russia. A 28-year-old man who works at a New York university was hospitalized Wednesday night, two days after he had flown into Moscow from New York to visit his relatives. The condition of the patient, a resident of the Moscow region town of Zhukovksy, has improved significantly, and he was to be released from the hospital as early as Monday, Interfax cited an unidentified health official as saying.
A spokeswoman for the Federal Consumer Protection Service declined to comment on the report.
As of Sunday, the World Health Organization reported that at least 12,043 swine flu cases have been registered in 44 countries, leading to 86 deaths.
The Federal Consumer Protection Service said more than 1,991 flights with 146,846 passengers and 13,875 crew members arriving to Russia from abroad have been screened at 11 of the country's international airports.
Onishchenko has recommended that Russians avoid visiting countries where swine flu cases have been confirmed, including the United States, Spain and Japan.
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