The BBC reports from the city of Ushuaia, where experts have been sent to investigate the origins of the outbreak.
Related stories
Zelensky Takes a Risk by Publicly Confronting Trump Over Russia
Zack Polanski says application of Zionism is racist and no state has right to exist
Ukrainian drone attack on Russia’s St Petersburg kills 1, hits energy sites
Russia’s war in Ukraine puts Europe on edge
European Parliament votes to confront Muslim Brotherhood, 'Islamist entryism' in overwhelming vote
Gaza Family Reunion: Finding each other after the ‘ceasefire’