However, Thongchai Lertwilairatanapong, inspector general of the public health ministry, said preliminary blood checks indicated "all kids showed signs of infection".
"There's no concern about long term effects", Jedsada said at a press briefing held at the Chiangrai Prachanukroh Hospital.
Rescue operation chief Narongsak Osotthanakorn, former governor of Chiang Rai, made the announcement at the Pong Pha tambon administration organisation near the cave on Tuesday morning.
Four more boys were rescued overnight after the first four emerged yesterday.
Rescuers resumed preparations on Tuesday for a third rescue operation deep into a cave complex in northern Thailand to free four remaining boys and their soccer coach in a race against time and monsoon weather. "But if the rain god doesn't help, then it could be challenging". "Some even joked with Prime Minister Prayut Chan-o-cha when he visited them on Monday night", Jessada said.
Twelve members of the Wild Boar youth football team were underground from 23 June after going for a picnic with their coach after practice.
Several ambulances were seen leaving the rescue site at around 12:40 p.m. local time, although it was unclear if the boys were inside.
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On July 4, Thai navy SEALS released video of the boys who appeared to be in good spirits despite the harrowing conditions. It was 10 days before the boys were miraculously located, and the remaining five have been in the cave for eight days. "I want to send my moral support for all involved" in the rest of the mission.
He said the last five survivors in the cave were in good health, adding that those who are now at the hospital could not eat fried rice yet because they will have to adjust themselves with the eating.
Information on the rescue operation, the health of those rescued - and their identities - has been tightly guarded by Thai authorities.
Medical teams previously said concerns included hypothermia and an airborne lung infection known as "cave disease", which is caused by bat and bird droppings.
"We expect that everybody will be out today, the children and coach and everybody will be out today", Osatanakorn told reporters.
All of the boys had shed a kilogram or two while trapped in the cave but were now able to get out of their hospital beds and walk around.
The president of soccer's governing body, FIFA, has invited the boys to the World Cup final in Moscow on Sunday if they make it out in time.