Use of specific agar plates for early detection of anaerobic bacteria in surgical site infections after spinal surgery: a prospective single centre study.
APMIS 2022;
131:26-33. [PMID:
36226772 DOI:
10.1111/apm.13278]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Accepted: 10/12/2022] [Indexed: 11/27/2022]
Abstract
AIM
To determine if additional agar plates could allow earlier detection of anaerobes in spinal surgical site infections (SSIs).
EXPERIMENTAL DESIGN
Prospective study (November 2017-January 2019) of patients with early spinal SSIs. In addition to routine 14-day cultures, surgical samples were inoculated onto three additional plates (CDC anaerobe agar with 5% sheep blood [CDC], CDC anaerobe laked sheep blood agar with kanamycin/vancomycin [BBL], and Bacteroides bile esculin [BBE] agar with amikacin (BD, USA)) incubated under anaerobic conditions (72h, 37°C). The primary endpoint was detection of anaerobes by these methods, as compared to routine culture.
MAIN RESULTS
Anaerobes were identified in 7/61 patients (11%) using the routine procedure and in one extra case with additional plates (overall detection rate 8/61, 13%). Sensitivity was greater for the CDC plate than for the BBL and BBE plates. When routine culture was positive, the CDC plate was always positive, and in three cases showed at least one additional anaerobe.
CONCLUSIONS
Using additional agar plates, anaerobes were identified in early spinal SSI in 13% of patients. Within 3 days, CDC agar plate enabled detection of anaerobes in one extra case and at least one additional anaerobe in three other cases, compared to routine 14-day culture.
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