During the COVID-19 pandemic, many countries and territories imposed quarantines, entry bans, or other travel restrictions for citizens of or recent travelers to the most affected areas. Some countries and territories imposed global restrictions that apply to all foreign countries and territories, or prevented their own citizens from travelling overseas.
Travel restrictions reduced the spread of the virus. However, because they were implemented after community transmission had begun in several countries around the globe, they produced only a modest reduction in the total number of infections. Travel restrictions may be most important at the start and end of a pandemic.