To the Editor: The screening criteria to identify young infants at low risk of serious bacterial infection as originally proposed by Dagan et al.1,2 and subsequently modified and used by others3,4 do not include a chest film or a lumbar puncture. The savings achieved with the approach described by Baker et al. (Nov. 11 issue)5 would be substantially greater if these two diagnostic tests could be dispensed with. What was the usefulness of the lumbar puncture in the infants who otherwise were at low risk of serious bacterial infection? Did any infant who did not appear to be.
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