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Queen Sirikit is known as the &quot;Queen Mother&quot; of Thailand as the mother of King Maha Vajiralongkorn and widow of King Bhumibol Adulyadej. 
The Queen&rsquo;s doctors examined her at 6pm on Tuesday and found she had a fever caused by an infection and advised admission to Chulalongkorn for closer examination, said the announcement.

HM Queen Sirikit to stay in hospital for treatment

Her Majesty Queen Sirikit has been admitted to Chulalongkorn Hospital in Bangkok suffering from cystitis, an inflammation of the bladder, according to the Bureau of the Royal Household on Wednesday.