Argentina has restricted entry to most foreign travelers, except for nationals and residents, and repatriation, medical, and humanitarian flights.
If you believe you might fall into one of these categories, you must contact the Argentine Migrations Office (Migraciones) to seek approval for you trip.
All travellers to Argentina (including those in transit to another country) must fill in an electronic ‘sworn statement’ form within 48 hours of travelling.
All travelers need to isolate for 7 days, a test will be taken upon arrival and a second test 7 days after, at their own cost.
After 7 days of quarantine, travelers can get a test. If the test is negative, travelers do not need to quarantine further.
Children under the age of 2 are exempt from presenting a COVID-19 test.
Travelers with proof of recovery from the virus within the last 90 days prior to boarding. Proof of a recent positive viral test and a letter from your healthcare provider or a public health official stating that you were cleared to travel.
More info at the CDC site
Travelers who did not get tested, are advised to stay home and self-quarantine for 10 days after travel.
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