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What is the Electronic Visa Update System (EVUS)?

What is the Electronic Visa Update System (EVUS)?

EVUS is the online system used by nationals of China holding a 10-year B1/B2, B1 or B2 (visitor) visa periodically to update basic biographic information to facilitate their travel to the United States.  In addition to a valid visa, such travelers will be required to complete an EVUS enrollment to be admitted into the United States.