Anaerobes isolated from 804 clinical specimens, considered not to have been contaminated by normal flora, during the five years between January 1978 and December 1982 at the Medical College Hospital of Oita and Nagasaki University Hospital, and aerobes isolated with the anaerobes were analyzed according to the species and frequency, in order to obtain data on the pathogenesis of anaerobic infection and its treatment.Anaerobes alone were isolated from 34.5% of the specimens, and they were isolated together with aerobes from 75.5% of the specimens.Of 940 strains of anaerobes, the frequency of isolation of gram-negative rods including
Bacteroides fragilis was highest (47.6%), followed by grampositive cocci (21.5%), non-spore forming gram-positive rods (20.6%), gram-negative cocci (7.1%) and
Clostridium species (3.2%), in that order.Of 1, 183 strains of aerobes isolated with anaerobes, the isolation frequency of the family
Enterobacteriaceae was highest, 44.2%, followed by gram-positive cocci (41%), glucose non-fermentative gram-negative rods (7.4%), glucose fermentative gram-negative rods (3.8%), gram-negative cocci (3.1%) and grampositive rods (0.5%), in that order.The frequency of Escherichia coli isolation was highest (38.9%), followed by α-streptococci (27%), Streptococcus faecalis (21.3%), coagulase-negative staphylococci (16%),
Klebsiella aerogenes (13.3%) and
Pseudomonas aeruginosa (13%), in that order.There were characteristic relationships among the infection site, the isolates and isolation frequency of the species.The frequency of isolation of
B.fragilis was significantly correlated with that of
E.coli and
S.faecalis, which were isolated along with
B.Fragilis (by x
2-test: p<0.01, p<0.05, respectively).However, this tendency was not definitely observed for
P.aeruginosa or
Klebsiella species.
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