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On May 22, the US Citizenship and Immigration Services (USCIS) announced that applicants for permanent status should apply from their home countries "except in extraordinary circumstances".
The experimental jab is intended to be a "universal vaccine" which protects people against a range of viruses that have previously sparked deadly outbreaks including SARS, MERS and Covid-19.
Ayatollah Mojtaba Khamenei was appointed Iran's supreme leader in March after the death of his father and predecessor Ali Khamenei in US-Israeli strikes on February 28.