Proof of vaccination has been a requirement for international travel for decades, medical experts and journalists say
As the discussion surrounding vaccine passports continues, medical experts and journalists are explaining how proof of vaccination has been required for international travel for decades. Before COVID-19 came into the public ether, the required vaccinations have been used to prevent a multitude of diseases such as yellow fever, polio, meningitis and more. This comes on the heels of New York City's vaccine mandate for most indoor activities — the first of its kind in the US — on August 3.