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Fever in an infant younger than 60 days is defined as a rectal temperature 38 °C (100.4 °F) or higher without evidence of a localized infection such as pneumonia, bronchiolitis, cellulitis, or abscess. In this age group, fever may be the only presenting sign of urinary tract infection (UTI), bacteremia, or bacterial meningitis, with UTI being the most prevalent of these (> 10% of cases). Bacteremia (< 2% of cases) and bacterial meningitis (< 0.5% of cases) are rare and now categorized as invasive bacterial infections (IBIs), with infants 21 days and younger at highest risk.

The most likely organisms...

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