Haemophilus influenzae

General Susceptibility

  • 2nd & 3rd generation cephalosporins

  • Amoxicillin/Clavulanate

  • Fluoroquinolones

  • Clarithromycin

  • Azithromycin

  • Doxycycline

For invasive infections, prefer ceftriaxone as empiric therapy until susceptibilities provided - then use ampicillin.

Variable susceptibility to:

  • Amoxicillin/Ampicillin (via beta-lactamase)

  • TMP/SMX

Resistant to:

  • 1st generation cephalosporins
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