Pneumonia among adults hospitalized with laboratory-confirmed seasonal influenza virus infection—United States, 2005–2008

Table 2 Sterile site^a bacterial coinfections among adults hospitalized with laboratory-confirmed influenza with and without pneumonia, Emerging Infections Program, 2005–2008 (n = 129)

Pathogen	Patients with pneumonia n = 61; no. (%)	Patients without pneumonia n = 68; no. (%)
Streptococcus pneumoniae	17 (28)	6 (9)
Group A streptococcus	4 (7)	3 (4)
Haemophilus influenzae	1 (2)	0
Neisseria meningitidis	1 (2)	0
Staphylococcus aureus	28 (46)	30 (44)
MRSA	15	14
MSSA	10	16
Unknown	3 (5)	0
Gram negative rods^b	3 (5)	10 (15)
Other streptococci^c	4 (7)	8 (12)
Other pathogens^d	2 (3)	5 (7)
Unknown pathogens	1 (2)	6 (9)

Information on the presence of select bacterial infections was available only for patients who had a positive culture
^aSterile site infections included the following: 118 (91 %) obtained from blood; 3 (2 %) obtained from CSF; 4 (3 %) obtained from pleural fluid; 4 (3 %) obtained from biopsy tissue
^bGram negative rods include: Escherichia coli, Acinetobacter baumanii, Enterobacter cloacae, Klebsiella pneumoniae, Proteus mirabilis and Pseudomonas aeruginosa
^cOther streptococcus species include: agalactiae, group G streptococcus, oralis, mitis, parasanguinis, salivarus, viridians group streptococci
^dOther pathogens include: Aerococcus viridans, Enterococcus faecium, Propionibacterium acnes, Clostridium perfringens, Corynebacterium striatum, Staphylococcus hominis

ISSN: 1471-2334