Pope under 'complex clinical situation

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Doctors have changed treatment for Pope Francis' respiratory tract infection to tackle a "complex clinical situation" and he will remain in hospital for as long as necessary, the Vatican said on Feb 17.

"The results of the tests carried out in recent days and today have demonstrated a polymicrobial infection of the respiratory tract, which has led to a further modification of the therapy," said a brief statement.

"All tests conducted up to today are indicative of a complex clinical picture that will require an appropriate hospital stay," it added.