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. 2004 Jan 14;130(1):1–45. doi: 10.1016/j.otohns.2003.12.003

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Copyright © 2004 American Academy of Otolaryngology–Head and Neck Surgery Foundation, Inc. Published by Mosby, Inc. All rights reserved.

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Fig 7 — The prevalence of β-lactamase production by H influenzae over the past several years in the United States.89, 90, 91