The attached selleck products bacteria were fixed by adding 99% methanol to each well, and then the wells were emptied and dried before 200 μL of 2% gentian violet 4% in 12% ethanol was added. The dye bound to the adherent cells was resolubilized

by adding 200 μL of gentian violet 4% in 12% ethanol to each well. The optical density (OD) of each well was determined photometrically at 595 nm. Wells originally containing sterile medium and non-biofilm producing bacteria Staphylococcus epidermidis, ATCC 12228 served as a control. The test was carried out in quadruplicate. The reference value for calculating adherence was OD 0.126. This number was calculated from the blank readings as mean + 3 × SD. Readings ≤ 0.126 OD were classified selleck compound as a non biofilm producer and readings > 0.126 OD as a biofilm producer [35]. Statistical analysis Fisher exact test was used for comparing

hVISA, MRSA and MSSA results. Selleck Volasertib Significance level was set at p < 0.05. Acknowledgements The work was part of the M.A. thesis of Ms. L. Lago and was supported by a grant from the Ministry of health, Israel. References 1. Garnier F, Chainier D, Walsh T, Karlsson A, Bolmström A, Grelaud C, Mounier M, Denis F, Ploy MC: A 1-year surveillance study of glycopeptide-intermediate Staphylococcus aureus strains in a French hospital. J Antimicrob Chemother 2006, 57:146–149.CrossRefPubMed 2. Maor Y, Rahav G, Belausov N, Ben-David D, Smollan G, Keller N: Prevalence and characteristics of heteroresistant vancomycin-intermediate Staphylococcus aureus bacteremia in a tertiary care center. J Clin Microbiol 2007, 45:1511–1514.CrossRefPubMed 3. Maor Y, Hagin M, Belausov N, Keller N, Ben-David D, Rahav G: Clinical features of heteroresistant vancomycin-intermediate Staphylococcus aureus bacteremia versus those of methicillin-resistant Dichloromethane dehalogenase S. aureus

bacteremia. J Infect Dis 2009, 199:619–624.CrossRefPubMed 4. de Lassence A, Hidri N, Timsit JF, Joly-Guillou ML, Thiery G, Boyer A, Lable P, Blivet A, Kalinowski H, Martin Y, Lajonchere JP, Dreyfuss D: Control and outcome of a large outbreak of colonization and infection with glycopeptide-intermediate Staphylococcus aureus in an intensive care unit. Clin Infec Dis 2006, 42:170–178.CrossRef 5. Mallaval FO, Carricajo A, Delavenna F, Recule C, Fonsale N, Manquat G, Raffenot D, Rogeaux O, Aubert G, Tous J: Detection of an outbreak of methicillin resistant Staphylococcus aureus with reduced susceptibility to glycopeptides in a French hospital. Clin Microbiol Infect 2004, 10:459–461.CrossRefPubMed 6. Nonhoff C, Denis O, Struelens MJ: Low prevalence of methicillin-resistant Staphylococcus aureus with reduced susceptibility to glycopeptides in Belgian hospitals. Clin Microbiol Infect 2005, 11:214–220.CrossRefPubMed 7.