MICA Legionella, an innovative and rapid method for enumeration of Legionella pneumophila in French sanitary water.

A new innovative method, MICA Legionella, allows for the automatic enumeration of Legionella pneumophila in domestic water samples in 2 days, with a detection limit of 2 CFU per test portion. Here we show that it gives equivalent results to those obtained by the French standard method NF T90-431 in 7 to 15 days.

Validation of MICA Legionella for Enumeration of Legionella pneumophila in Sanitary Waters and Cooling Tower Waters: AOAC Performance Tested MethodSM 032201.

Background: Frequent testing for Legionella concentration in water is required by most health risk monitoring organizations worldwide. Domestic hot water and cooling tower water networks must be regularly controlled to prevent Legionnaires' disease, a potentially deadly lung infection. MICA Legionella is the fastest culture-based detection method for all serogroups of Legionella pneumophila, with automatic enumeration in 48 h and no need for confirmation.

Cytosolic and Secreted Peptidoglycan-Degrading Enzymes in Drosophila Respectively Control Local and Systemic Immune Responses to Microbiota.

Gut-associated bacteria produce metabolites that both have a local influence on the intestinal tract and act at a distance on remote organs. In Drosophila, bacteria-derived peptidoglycan (PGN) displays such a dual role. PGN triggers local antimicrobial peptide production by enterocytes; it also activates systemic immune responses in fat-body cells and modulates fly behavior by acting on neurons.

Role of the Outer Membrane and Porins in Susceptibility of β-Lactamase-Producing Enterobacteriaceae to Ceftazidime-Avibactam.

This study examined the activity of the novel antimicrobial combination ceftazidime-avibactam against Enterobacteriaceae exhibiting different outer membrane permeability profiles, specifically with or without porins and with or without expression of the main efflux pump (AcrAB-TolC). The addition of the outer membrane permeabilizer polymyxin B nonapeptide increased the antibacterial activities of avibactam alone, ceftazidime alone, and ceftazidime-avibactam against the characterized clinical isolates of Escherichia coli, Enterobacter aerogenes, and Klebsiella pneumoniae. This enhancement of activities was mainly due to increased passive penetration of compounds since inhibition of efflux by the addition of phenylalanine-arginine β-naphthylamide affected the MICs minimally.