Haemophilus influenzae

• Second & third 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 first generation cephalosporins.