Given the current health context, most countries require a negative test for Covid-19, quarantine and travel documents.
These conditions may change permanently.
All air passengers coming to the United States, including U.S. citizens and fully vaccinated people, are required to have a negative COVID-19 test result no more than 3 days before travel or documentation of recovery from COVID-19 in the past 3 months before they board a flight to the United States.
We advise you to consult those sites for updates.
Depending on your destination, it may be mandatory or recommended to be vaccinated against certain diseases (eg yellow fever in Mali). We invite you to get some information from the relevant authorities (Consulates, Embassies, and Ministry of Foreign Affairs).