All 21 Hawai'i students and three adult chaperones have been released from medical quarantine in South Korea, the Pacific and Asian Affairs Council said yesterday.

The students were quarantined because several of them tested positive for swine flu.

One chaperone who has developed pneumonia remained in a hospital, but the rest of the group has resumed its travel itinerary.

PAAC officials are investigating the possibility of extending the date of return to Hawai'i, so as to provide the students with the fullest range of experiences possible, as originally planned.

The return date is still currently set for Sunday.

The students, from public schools around the state, were selected by the PAAC to participate in a study tour of South Korea.

But when they arrived on June 22, thermal scans taken at Seoul Incheon Airport indicated elevated body temperatures in five of the students.

The five were taken to a hospital, where tests confirmed they had swine flu. The rest of the group was quarantined in its hotel.

Several other members of the group later were found to have swine flu.