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J Med Microbiol 55 (2006), 1285-1289; DOI: 10.1099/jmm.0.46512-0
© 2006 Society for General Microbiology
ISSN 1473-5644

Anaerobic bacteria in 118 patients with deep-space head and neck infections from the University Hospital of Maxillofacial Surgery, Sofia, Bulgaria

Lyudmila Boyanova1,{dagger}, Rossen Kolarov2, Galina Gergova1, Elitsa Deliverska2, Jivko Madjarov2, Milen Marinov2 and Ivan Mitov1

1 Department of Microbiology, Medical University of Sofia, Zdrave Street 2, 1431 Sofia, Bulgaria

2 University Hospital of Maxillofacial Surgery, Sofia, Bulgaria

Correspondence
Lyudmila Boyanova
lboyanova{at}hotmail.com or
l.boyanova{at}lycos.com

Received 8 January 2006
Accepted 31 May 2006

The aim of this study was to assess the incidence and susceptibility to antibacterial agents of anaerobic strains in 118 patients with head and neck abscesses (31) and cellulitis (87). Odontogenic infection was the most common identified source, occurring in 73 (77.7 %) of 94 patients. The incidence of anaerobes in abscesses and cellulitis was 71 and 75.9 %, respectively, and that in patients before (31 patients) and after (87) the start of empirical treatment was 80.6 and 72.4 %, respectively. The detection rates of anaerobes in patients with odontogenic and other sources of infection were 82.2 and 71.4 %, respectively. In total, 174 anaerobic strains were found. The predominant bacteria were Prevotella (49 strains), Fusobacterium species (22), Actinomyces spp. (21), anaerobic cocci (20) and Eubacterium spp. (18). Bacteroides fragilis strains were isolated from 7 (5.9 %) specimens. The detection rate of Fusobacterium strains from non-treated patients (32.2 %) was higher than that from treated patients (13.8 %). Resistance rates to clindamycin and metronidazole of Gram-negative anaerobes were 5.4 and 2.5 %, respectively, and those of Gram-positive species were 4.5 and 58.3 %, respectively. One Prevotella strain was intermediately susceptible to ampicillin/sulbactam. In conclusion, the start of empirical treatment could influence the frequency or rate of isolation of Fusobacterium species. The involvement of the Bacteroides fragilis group in some head and neck infections should be considered.

{dagger}Correspondence should be sent to blvd ‘Evlogui Georgiev’ 76 – B, 1124 Sofia, Bulgaria.






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