Haemophilus influenzae
Ceftibuten is active against "Haemophilus influenzae", "Moraxella catarrhalis", "Escherichia coli", "Klebsiella pneumoniae", "K. oxytoca", "Proteus vulgaris", "P. mirabilis", "P. providence", "Salmonella" sp., "Shigella" sp., "Enterobacter" sp., and "Streptococcus" sp.