Argentine President Alberto Fernandez has tested positive for the coronavirus.
He tweeted on Saturday that, as he had a mild headache and ran a fever of 37.3 Celsius previous day, he took an antigen test which showed he had the virus.
Fernandez turned 62 on Friday. He said he is waiting for the result of the PCR test. He said he is physically well and is staying on the job while in isolation.
His doctor said that his case is mild largely due to the protective effect of the vaccine.
He had received his first shot of the Russian vaccine, Sputnik V, in January and the subsequent injection as recommended.
Reuters reported that Russia's Gamaleya Institute, which developed the vaccine, said in a statement that Sputnik V is 91.6 percent effective against infection and 100 percent effective against severe cases.
The tally by Johns Hopkins University in the United States shows that Argentina has more than 2.37 million coronavirus cases so far. More than 56,000 people died.