Table 2.

Bacteria that cause respiratory infection in patients with hematological malignancy.

Gram positive	Gram negative	Anaerobes	Atypical
Streptococcus pneumoniae Streptococcus pyogenes Staphylococcus aureus Nocardia asteroides Rhodococcus equi	Pseudomonas spp. Klebsiella pneumoniae Escherichia coli Enterobacter cloacae Stenotrophomonas maltophilia Citrobacter spp. Serratia marcescens Acinetobacter baumanii Hemophilus influenzae Proteus spp. Burkholderia spp. Achromobacter spp. Moraxella catarrhalis	Prevotella spp. Fusobacterium spp. Bacteroides spp.	Mycoplasma pneumoniae Chlamydophila pneumoniae Legionella spp.

Modified from Evans and Ost.⁴