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Peptostreptococcus Species J. Med. Microbiol. Ð Vol. 49 2000), 747±751 # 2000 The Pathological Society of Great Britain and Ireland ISSN 0022-2615 CLINICAL MICROBIOLOGY Evaluation of a phenotypic scheme for the identi®cation of `butyrate-producing' Peptostreptococcus species M.J.WILSON,V.HALLÃ,J.BRAZIERÃ andM.A.O.LEWIS Department of Oral Surgery, Medicine and Pathology and ÃPHLS Anaerobe Reference Unit, Department of Medical Microbiology and Public Health Laboratory, University of Wales College of Medicine, Heath Park, Cardiff CF14 4XN Gram-positive anaerobic cocci GPAC) are isolated from approximately one quarter of all infections involving anaerobic bacteria. However,studies of the signi®cance of this group of pathogens have been hindered by an inadequate taxonomy and the lack of a valid identi®cation scheme. In the present study,a phenotypic scheme for the identi®cation of `butyrate-producing' GPAC based on the analysis of volatile fatty acid pro®les by gas-liquid chromatography,biochemical pro®les including the use of the rapid ID 32 A commercial kit) and carbohydrate fermentation reactions,was evaluated. The identity of 68 clinical isolates of GPAC was determined by application of the scheme published by Murdoch. The scheme was found to be easy to apply and only four of the test isolates could not be readily assigned to a species or well-de®ned group. The species most frequently identi®ed in the test collection were Peptostreptoccoccus vaginalis, P. tetradius and the âGAL group. A large number of strains was assigned to the heterogeneous ` prevotii=tetradius' group. Some species regarded as being restricted to particular clinical sites were shown to be more widespread than previously thought. The clinical source of the isolates did not show any consistent correlation with species identity. Introduction DNA hybridisation and pyrolysis mass spectrometry PMS) have better de®ned the taxonomic groups within Gram-positive anaerobic cocci GPAC) are members of the GPAC [6±8]. the commensal micro¯ora in a range of body sites [1]. However, GPAC account for 24±31% of all isolates Following the recent reclassi®cation of P. heliotrinre- from anaerobic infection and, on occasions, may be ducens as Slackia heliotrinreducens [9], there are isolated in pure culture from infected sites [2±5]. currently 16 species in the genus Peptostreptococcus. Three of these species, P. harei, P. octavius and P. ivorii In the past, GPAC have been little studied because of were proposed relatively recently [10]. Two other well- the lack of a sound classi®cation scheme and the de®ned groups, the `âGAL' group and the `trisimilis' recognised heterogeneity of the previously de®ned group of strains, have been described, and it has been species. Most clinical isolates of GPAC are identi®ed suggested that these merit species status [11]. to species level within the genus Peptostreptococcus. Correct identi®cation of these species is essential to It has been shown recently that the GPAC species, as determine whether individual taxonomic groups are supported by the molecular data, can be discriminated associated with speci®c sites of isolation or disease by routine phenotypic methods. Murdoch summarised conditions. Recent taxonomic studies based on mole- the differential characteristics of the GPAC [11], cular approaches such as ribosomal RNA sequencing, including the newly described species, based on volatile fatty acid VFA) pro®les, carbohydrate fer- mentation reactions and the enzyme pro®les obtained Received 9 Aug. 1999; revised version received 17 Oct. with the rapid ID 32 A commercial kit. In particular, 1999; accepted 12 Nov. 1999. the work demonstrated the considerable heterogeneity Corresponding author: Dr M. A. O. Lewis e-mail: within the group producing butyric acid as the terminal [email protected]). VFA of glucose metabolism. 748 M. J. WILSON ET AL. The aim of the present study was to assess the did not show any consistent correlation with species usefulness of the Murdoch scheme [11] and the revised identity. taxonomy for the identi®cation of previously unspe- ciated strains of butyrate-producing GPAC referred to the PHLS Anaerobe Reference Unit and to determine Discussion whether there was any association between species and site of isolation. The current study con®rms the value of the identi®ca- tion method proposed by Murdoch [11]. The methods were easy to perform in routine diagnostic work and Materials and methods the identi®cation scheme could be readily applied. The majority of test isolates gave consistent results and All strains tested were from the PHLS Anaerobe were identi®ed easily. The scheme, which is based on Reference Unit culture collection, Department of conventional phenotypic methods and relies heavily on Medical Microbiology and Public Health Laboratory, the generation of a biochemical enzyme pro®le with a Cardiff. The clinical source is indicated where known commercial kit for species differentiation, has been Table 1). Stock cultures were stored at À808Con supported by additional taxonomic studies based on Microbank beads Prolab Diagnostics, Cheshire). molecular analyses and PMS [6]. The value of such Strains were subcultured on Fastidious Anaerobe Agar commercial kits can be appreciated not only for rapid FAA; Lab M, Bury) supplemented with horse blood identi®cation of known species but also the recognition 5% and incubated in anaerobic conditions CO2 10%, of novel taxa. `ADH' and Hare group III were H2 10%, N2 80%) at 378C. Strains were examined recognised as distinct by the enzyme pro®les before according to Gram's stain morphology, growth charac- formal species identi®cation as P. vaginalis and P. teristics, carbohydrate fermentation reactions [12] and hydrogenalis. VFA pro®les determined by gas-liquid chromatography [13]. Strains were also analysed with the rapid ID 32 A P. vaginalis was proposed as a new species in 1992 on identi®cation kit for anaerobes bioMeÂrieux, Lyon, the basis of DNA hybridisation studies and is thought France) according to the manufacturer's instructions. to be one of the more pathogenic species of GPAC The bacterial suspension for inoculation of the [8, 11]. Ten of the test strains were identi®ed as P. commercial kit was obtained by harvesting growth vaginalis and were easily recognised on the basis of from the surface of Columbia blood agar plates their pre-formed enzyme pro®les PEP). Three strains Oxoid) after anaerobic incubation for 48 h to produce were consistently only weakly positive for ADH. None a bacterial suspension of McFarland standard 4 of the 10 strains identi®ed as P. vaginalis formed turbidity. Identi®cation was based upon visual inter- indole, a ®nding which has been reported previously pretation of the rapid ID 32 kit results. only for a minority of strains. Interestingly, this species has been isolated mainly from subdiaphragmatic infections although, in the present study, strains Results identi®ed as P. vaginalis were isolated from a range of super®cial sites eye and ear) and deep sites Seven strains selected for study were found not to be including three isolates from the brain and cerebrosp- butyrate producers and were easily identi®ed as P. inal ¯uid. magnus 5) and P. micros 2). Of the remaining 61 butyrate producers, 57 were easily identi®ed according Nine strains were identi®ed as belonging to the `âGAL' to the scheme and their identities are shown in Table 1. group. Although regarded as a relatively heterogeneous The most frequently identi®ed species were P. tetradius collection of organisms, the present study has con- 11) and P. vaginalis 10). Other groups represented by ®rmed that members of this group can be differentiated a large number of test strains included the âGAL group easily from other species on the basis of their PEPs. 9) and the prevotii=tetradius group 10). In most The range of sites from which the âGAL strains were cases, VFA pro®les, sugar fermentation patterns and isolated is similar to that reported previously and enzyme pro®les from the commercial kit for each of included soft tissue abscesses and infected graft sites. these strains correlated with the results obtained in the Murdoch study [11]. Minor exceptions included three Eleven isolates produced pro®les characteristic of strains of P. vaginalis that produced only weak positive either P. asaccharolyticus or P. harei. It has been results for ADH. This was reproducible on repeated suggested that these species can be easily differentiated testing. Four strains yielded pro®les which did not on the basis of cell and colony characteristics. Colonies correlate with those described in the Murdoch scheme of P. asaccharolyticus are reported as being more [11]. The pro®les obtained are shown in Table 1 and convex and the cells are of more uniform size. were con®rmed by repeated testing on at least two However, these morphological properties may be occasions. Optimal bacterial growth was con®rmed on medium dependent, making them unreliable as a basis each occasion by the demonstration of McFarland for differentiation of the species and it was decided that standard 4 turbidity. The clinical source of the isolates for these 11 strains such characteristics were not Table 1. Differential characteristics of `butyrate-producing strains of GPACÃ Number Production of Carbohydrate fermentation reactions Production of saccharolytic and proteolytic enzymes of Terminal Species isolates VFA Indole Urease ALP ADHGlu Lac Raf Rib Mne áGAL âGAL áGLU âGUR ArgA ProA PheA LeuA PyrA TyrA HisA P. vaginalis 10 B ÀÀÀ=w ÀÀÀÀÀÀÀÀÀÀÀÀ âGAL group 9
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