Doctors reported yesterday that a blood test and a chest X-ray showed that an infection detected in early September had cleared up, the palace said in a statement.
It said King Bhumibol Adulyadej's pulse, blood pressure, breathing, blood oxygen level and body temperature were normal.
"The doctors stopped giving him antibiotic medicines and stopped putting him on a drip," said the statement, released late yesterday. "They will still give him physical therapy."
He has spent most of the past six years in Bangkok's Siriraj Hospital, parts of which serve as his de facto palace While he is a constitutional monarch with no formal political role, Bhumibol has generally been regarded as Thailand's unifying figure.
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The heir apparent, Crown Prince Vajiralongkorn, does not yet command the same respect and affection as the king.
In 2007, the king was hospitalised for three weeks with symptoms of a minor stroke. This past August, the palace said he was recovering from several ailments, including excess fluid in the brain and difficulty breathing due to congested lungs.