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Otitis media with effusion (OME) and ear infections are connected in two ways: 1  After most ear infections have been treated, fluid (an effusion) remains in the middle ear for a few days or weeks.  When the Eustachian tube is partially blocked, fluid builds up in the middle ear.
Most children get ear infections, and about 10% will still have fluid in the ear three months after the infection clears up. Because this problem is so common, even mild long-term consequences are a concern for doctors and researchers.