Argentine President Alberto Fernandez has been diagnosed with coronary heart disease despite being vaccinated.
Mr Fernandez, 62, posted on his Twitter account that he was in good health despite feeling a slight fever.
But he added that it would be better for him to finish celebrating his birthday without getting such a story.
In January Mr Fernandez was vaccinated against the Russian-produced Sputnik corona, the first president from Latin America to be vaccinated.
Quería contarles que al terminar el día de hoy, luego de presentar un registro de fiebre de 37.3 y un leve dolor de cabeza, me realice un test de antígeno cuyo resultado fue positivo.
— Alberto Fernández (@alferdez) April 3, 2021