President Alberto Fernandez of Argentina, who has been vaccinated against Covid-19, announced late Friday that he had tested positive for the coronavirus.
“At the end of today, after presenting a fever of 37.3 (99 Fahrenheit) and a slight headache, I performed an antigen test, which was positive,” he tweeted.
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A PCR test later confirmed the diagnosis.
The president, who turned 62 on Friday, was in isolation as a precaution but said he was “physically well.”
“Although I would have liked to end my birthday without this news, I am also in good spirits,” he said.
On Saturday he told Radio 750 that he has “no idea how I got infected.”
“I am someone who takes very good care of myself. If it were not for the vaccine, I would be having a very bad time,” he said.
Fernandez was inoculated with the Russian Sputnik V vaccine and had his second shot on February 11, sources in the presidency told AFP.
Argentina is facing a second wave of the coronavirus with a sustained rise in cases.
The South American country of 45 million inhabitants has recorded more than 2.3 million infections and over 56,000 deaths from Covid-19.
More than 4.1 million people there had been vaccinated as of Saturday.