Organizers of the four-day CES trade show will require an additional layer of COVID-19 testing for some of the more than 100,000 attendees expected at the event next week.

The Consumer Technology Association on Thursday announced it will require a negative COVID test for attendees arriving from China, Hong Kong or Macao between Jan. 1-4.

The requirement is an additional safeguard for show exhibitors and attendees prior to the start of the show. CES runs from Jan. 5-8 at several Las Vegas convention venues, but there are numerous pre-show events leading up to its opening day.

“The Centers for Disease Control and Prevention announced that as of Jan. 5, travelers to the U.S. from China, Hong Kong and Macao will be required to present proof of a negative COVID-19 test to their airline before boarding,” a representative of the association said in an emailed statement.