If there is a sick passenger on an international or domestic flight, chances are that you won’t hear about it until days, weeks, or even months later. Because of all the additional measures such as onsite rapid testing and additional screenings, most people who are infected while traveling may be asymptomatic or in the early stages when a negative result is still possible. This means that you won’t hear about it until much later. Once a person who has traveled on a flight with you does become sick, the process of contacting everyone they’ve been in close proximity with while they were infectious is rather speedy. A public health official contacts the CDC who then starts a contact investigation; this includes them contacting and informing everyone the sick person may have exposed the virus to. Make sure that your contact information is always correct and updated when you travel so that the CDC can reach you if necessary and inform you of any additional measures you may need to take to protect yourself and others.