Related Experiment Videos
Isolation and characterization of Actinomyces propionicus
Abstract:
Three cultures of Actinomyces have been identified as Actinomyces propionicus. Two of these strains are recent isolates, one, 427, from a case of cervico-facial actinomycosis, and one, 439, from a case of lacrimal canaliculitis. The third strain, 346, was described by F. Lentze as A. israelii serological type II. These three strains were compared with the type strain of A. propionicus ATTC 14157 and with known strains of five other Actinomyces species. Morphologically and biochemically the three new cultures of A. propionicus were identical with the type strain but closely resembled A. israelii. In serological tests making use of fluorescent antibody, all four A. propionicus strains gave negative results with antisera for A. israelii, A. bovis, A. naeslundii, and A. eriksonii, but gave positive results with antisera for A. propionicus 14157 and strain 346. The A. propionicus antisera did not stain other Actinomyces species. A. propionicus contains diaminopimelic acid (DAP) in its cell wall and produces propionic acid from glucose. All three new isolates were shown to contain DAP and to produce propionic acid. By use of the presence of DAP in the cell wall and serological tests as the differential criteria, the three cultures described in the report were specifically identified as A. propionicus.
Insights
Three new Actinomyces propionicus cultures were identified using cell wall analysis and serological tests. These findings aid in distinguishing A. propionicus from other Actinomyces species.
Area of Science:
- Microbiology
- Bacteriology
Background:
- Actinomyces propionicus is a bacterium implicated in human infections.
- Accurate identification of Actinomyces species is crucial for diagnosis and treatment.
Purpose of the Study:
- To identify and characterize three new bacterial isolates as Actinomyces propionicus.
- To differentiate these isolates from other closely related Actinomyces species.
Main Methods:
- Morphological and biochemical characterization of bacterial isolates.
- Serological testing using fluorescent antibody techniques.
- Analysis of cell wall composition for diaminopimelic acid (DAP).
Main Results:
- Three new isolates were morphologically and biochemically identical to the A. propionicus type strain.
- Serological tests confirmed the identity of the three isolates as A. propionicus.
- All identified A. propionicus strains contained DAP and produced propionic acid.
Conclusions:
- The three new cultures are definitively identified as Actinomyces propionicus.
- Diaminopimelic acid presence and serological profiles are reliable criteria for A. propionicus identification.
- This study contributes to the accurate classification of Actinomyces species.