Reduced susceptibility and resistance to bedaquiline in clinical M. tuberculosis isolates.

Objectives: Bedaquiline is an effective drug used to treat MDR and XDR tuberculosis, providing high cure rates in complex therapy. Mutations in the mmpR (rv0678) and atpE genes are associated with reduced susceptibility to bedaquiline and have been identified in both in vitro selected strains and clinical isolates. However, the phenotypic criteria used to detect bedaquiline resistance have yet to be established due to the collection of few clinical isolates from patients receiving bedaquiline-containing treatment regimens.

Examination of bedaquiline- and linezolid-resistant Mycobacterium tuberculosis isolates from the Moscow region.

Objectives: To study the isolates with acquired resistance to bedaquiline and linezolid that were obtained from patients enrolled in a clinical study of a novel therapy regimen for drug-resistant TB in Moscow, Russia.

Methods: Linezolid resistance was detected using MGIT 960 with a critical concentration of 1 mg/L. The MIC of bedaquiline was determined using the proportion method.

[The transplantation of rabbit embryos].

Criteria of morphological assessment of zygote quality and various transplantation conditions have been studied to achieve implantation in the host female and obtain the offspring. The data obtained indicate that implantation of 10-15 zygotes with light homogeneous cytoplasm and distinct pronuclear membrane per recipient female may be regarded as optimal conditions.