Travelers said they were not asked for proof of residency in the US at vaccination centers and some of them showed their national identity cards or passports. The Centers for Disease Control and Prevention (CDC) says "jurisdictions cannot add United States citizenship requirements or require United States citizenship verification as a condition for vaccination."

"I'm 46-years old and I didn't think I could be vaccinated in my country before December. I have seen people dying getting closer and closer to home," San Martin said.

"You have to fill in a simple form, they asked for an ID to confirm your name, I showed my Mexican national ID and that was all," Card says.Both Mexico and Peru have been hard hit by the pandemic. Mexico has passed 2,399,790 Covid-19 cases followed by Peru with more than 1,932,255 cases, according to Johns Hopkins University data.