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Distribution of Haemophilus influenzae serotype b strains classified by ampicillin (ABPC) or clavulanic acid/amoxicillin (CVA/AMPC) resistance in phases 3 and 4. BLNAS, β-lactamase-nonproducing ABPC-sensitive strain; BLNAI, β-lactamase-nonproducing ABPC-intermediately resistant strain; BLNAR, β-lactamase-nonproducing ABPC-resistant strain; BLPAR, β-lactamase-producing ABPC-resistant strain; BLPACR, β-lactamase-producing CVA/AMPC-resistant strain
