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culture

Experience with the use of an automated system for diagnosis of urinar y tract infections

Objective. To compare results of microbiological examination obtained on rapid automated system with semiquantitative plate culture to assess possibility and necessity of using the system in urine examination. Materials and Methods. The study included 231 urine samples collected from February to July 2023 from patients at Lomonosov Moscow State University Medical Research and Educational Center. The samples were cultured according to the standards of urine microbiological examination using chromogenic media and using an automatic HB&L system (Alifax, Italy) for 4 h.

Development of technology for longterm storage of Mycobacterium tuberculosis cultures

Objective. To develop a technology for freezing and long-term storage of mycobacteria cultures and implement into a microbiological laboratory routine practice. Materials and Methods. For comparison between different condition, the media for freezing mycobacteria containing 0.9% NaCl or Middlebrook’s 7H9 medium with the addition of glycerol at various concentrations: 0%, 4.0%, 20.0%, 50.0% (by final volume) was evaluated. To freeze suspensions of cultures, two methods were used: one – using a cryo-freezer (cooling rate of 1°C/min), the second – direct placement in a deep freeze at a temperature of -80°C.

Comparison of culture and isolation methods for Clostridioides difficile and other anaerobes from stool samples in a routine microbiological laboratory practice

Objective. To improve stool sample culture and isolation of anaerobic flora, including Clostridioides difficile in the routine microbiological laboratory practice at the children’s oncology hospital. Materials and Methods. A total of 517 stool samples collected from patients in children’s oncology hospital from 2013 to 2015 were studied. All samples were analyzed by ELISA for C. difficile toxins and by culture according to dedicated 5 schemes for isolation of anaerobic bacteria, including C.

Development of Chlamydial Arthritis Model in Rats

Objective. To develop and characterize experimental model of chlamydial arthritis in rats. Materials and Methods. Wistar male rats received an intra-articular injection of 0.15–0.20 ml of purified elementary bodies of Chlamydophila (Chlamydia) trachomatis L2/Bu-434 or Chlamydophila (Chlamydia) muridarum Nigg. Animals were divided into two groups: young rats (body weight: 350-380 g) and adult rats (body weight: 450–500 g). Results. No changes in the affected joints were observed in rats infected with C.