As several companies announced vaccines toward the end of 2020, hope returned for regular travel in 2021. Still, there is anxiety over the potential of catching COVID-19. Most people said that they wouldn't be doing any extra traveling, and many said that they are still concerned about exposure.
"'Vaccine hesitancy is a critical obstacle to overcome,' says Dr. Tom Kenyon, the chief health officer of Project HOPE, a global health and humanitarian relief organization, and a former director at U.S. Centers for Disease Control and Prevention (CDC). To get back to travel, the U.S. and the world need herd immunity, thought to be achieved when about 70 percent of the population has protective antibodies. Kenyon says, though, that '70 percent is an arbitrary figure, and there is no "off/on" switch with herd immunity.' Recent news about more transmissable strains of COVID-19 suggest that herd immunity might only come when 90 percent of citizens have antibodies."
