On May 31, the Central Epidemic Command Center (CECC) announced that, effective from 00:00 on June 1, 2022 (the incoming flight's arrival time in Taiwan), all passengers arriving in Taiwan from abroad will be required to have their saliva samples collected at the airport for PCR testing; after undergoing a saliva test, arrivals will proceed to follow quarantine measures.

The CECC reminded arrivals that they should not drink or eat in the period between landing and sample collection to ensure the quality of their samples; after entry, arrivals should go to their prearranged quarantine location (one person per residence protocol or quarantine hotel) to undergo quarantine. If the result from the saliva-based PCR test comes back positive, an individual observing the one person per residence protocol should receive care in their quarantine location, whereas an individual quarantining in a quarantine hotel should be sent to an enhanced quarantine hotel or government quarantine facility or a hospital as required by rules.