Unveiling electrotransformation of Moraxella catarrhalis as a process of natural transformation.

Frequency and Risk Factors of Moraxella catarrhalis Infection in Patients at Vali-Asr and Amirkabir Hospitals since August 2003 to March 2004

Background: Moraxella catarrhalis is Gram negative diplococci which is a member of Neisseriacae. It was considered as a harmless commensal of the upper respiratory tract. Since 1990 its pathogenecity was established and known as a common cause of respiratory infection, particularly otitis media, sinusitis and lower respiratory tract. The aim of this research was to determine the prevalence and ...

Reciprocal Genetic Transformation between Neisseria Catarrhalis and Moraxella Nonliquefaciens.

Expression of type IV pili by Moraxella catarrhalis is essential for natural competence and is affected by iron limitation.

Type IV pili, filamentous surface appendages primarily composed of a single protein subunit termed pilin, play a crucial role in the initiation of disease by a wide range of pathogenic bacteria. Although previous electron microscopic studies suggested that pili might be present on the surface of Moraxella catarrhalis isolates, detailed molecular and phenotypic analyses of these structures have ...

RNA-Seq-Based Analysis of the Physiologic Cold Shock-Induced Changes in Moraxella catarrhalis Gene Expression

BACKGROUND Moraxella catarrhalis, a major nasopharyngeal pathogen of the human respiratory tract, is exposed to rapid downshifts of environmental temperature when humans breathe cold air. The prevalence of pharyngeal colonization and respiratory tract infections caused by M. catarrhalis is greatest in winter. We investigated how M. catarrhalis uses the physiologic exposure to cold air to regula...

Use of API NH system for identification of Moraxella catarrhalis.

Barbe and coworkers tested 318 isolates of Haemophilus and Neisseria species as well as Moraxella catarrhalis in an evaluation of the API NH kit in a study primarily addressing the ability of that kit to accurately identify organisms in its intended area of application (1). They found that only 1 of the 305 strains that were included in the kit database was identified incorrectly, and of the 13...