When asked why the boys managed to survive so long underground before they were found by divers, Dr Jesada said: "The kids are footballers, are strong and have high immunity".
"Water levels are the same like the last two days", he said, adding that rescue efforts were expected to faster than they had been before.
At least two more boys have been rescued from inside Thailand's Tham Luang Nang Non cave as the second phase of a rescue operation to evacuate a teen soccer team and its 25-year-old coach continues. Rescue mission chief and former governor of the Chiang Rai province Narongsak Osottanakorn said the boys were not being named out of respect for the families who still had sons trapped in the cave. He was taken by helicopter and then ambulance to the hospital in Chiang Rai were the first four boys, who were rescued on Sunday, are now being held in quarantine as they undergo tests.
Four of the trapped Thai cave boys were rescued over the weekend, and on Monday, four more were transported to the hospital.
The boys rescued so far are in good overall health despite spending two weeks in the dank cave system, Jesada Chokedamrongsuk, permanent secretary of the ministry of public health, told a news conference in Chiang Rai.
A crack team of foreign divers and Thai Navy SEALs guided the boys during a nine-hour operation through almost 4 km (2.5 miles) of sometimes submerged channels from where they have been trapped for more than a fortnight.
Two of the rescued were reported to be battling a lung infection, although the boys were reported to be "cheerful" by medical professionals.
Last week, Musk said he was sending teams to Thailand from his private space exploration firm, SpaceX, and engineering firm, Boring Co. which is developing tunneling systems for transport projects.
Four of the boys were safely rescued on Sunday after rescuers carried out a risky operation, amid fears the waters will rise again to a unsafe level.
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Four boys and their soccer coach remain in the cave.
Heavy rains lashed the northern Thai region late yesterday and a steady downpour has continued into today.
Four more boys were brought out Monday from the flooded cave in Chiang Rai after four others were rescued on Sunday. Monday's rescue effort took about nine hours, two fewer than the day before, in a sign of growing confidence and expertise.
Narongsak would not identify the rescued boys.
Tech billionaire Elon Musk has also been lending a helping hand to the rescue effort.
Thailand's prime minister welcomed Musk into the cave complex late Monday, with the American later tweeting a standing offer of a mini-submarine escape pod to help the remaining five leave the tunnels.
Members of the trapped soccer team in a section of Tham Luang cave.
Earlier this week, Musk posted videos of the sub being tested in a swimming pool in California with simulated narrow passages like the cave.
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