If they caught in Argentina, if it really is a threat, thousands of Argentinians would have died from it already.
One report was that there was a bird-watching tour and one of the locations was a garbage dump. Besides birds, what other animal is there? Rats! Just walking around there, especially if the day is dry and windy could cause dust containing the virus to become airborne and inhaled.
In the US that is the most common way to contact the disease - sweep or vacuum an area where mouse urine and droppings are present. Before doing that spray the area with a 10% bleach solution, and wear a N95 mask and gloves; Immediately discard or wash outerwear clothing.