Indeed, in the present study, the current MLVA system for O157 was proven to be specific for O157. Modifications in this study enabled it to be applied for the analysis of, at least, EHEC O26 and O111. Other methods, therefore,
might also need to be evaluated and modified so they can be applied for the analysis of EHEC non-O157 strains. In conclusion, by using the MLVA system developed in this study, the EHEC strains of three major serogroups, such as O157, O26 and O111, can be analyzed on a single platform. Therefore, this system could be widely used for molecular Z-VAD-FMK nmr epidemiological studies of EHEC infections. We thank the staff of all the municipal and prefectural public health institutes for providing the EHEC isolates. We thank Ms Nobuko Takai, Ms Tamayo Kudo, and Ms Lee Jiyoung for their technical assistance. This work was partly supported by grants-in-aid from the Ministry of Health, Labour and Welfare of Japan (H21-Shokuhin-Ippan-005, H21-Shokuhin-Ippan-013, H20-Shinko-Ippan-013, and H20-Shinko-Ippan-015). “
“Although the Streptococcus pneumoniae polysaccharide capsule is an important virulence factor, ~ 15% of carriage isolates are nonencapsulated. Nonencapsulated S. pneumoniae are a cause of mucosal infections. Recent studies have shown that neutrophils kill S. pneumoniae predominately through neutrophil proteases,
such as elastase and cathepsin G. Another recent finding is that nonencapsulated pneumococci have greater resistance to resist cationic Maraviroc antimicrobial peptides that are important in mucosal immunity. We here show that nonencapsulated pneumococci have greater resistance to extracellular human neutrophil elastase- and cathepsin G-mediated killing than isogenic encapsulated pneumococci. Resistance to extracellular neutrophil protease-mediated killing is likely to be of greater relative importance on mucosal
surfaces compared to other body sites. Clomifene Streptococcus pneumoniae is a major human pathogen. The contribution of S. pneumoniae virulence factors in host respiratory colonization and disease varies according to the in vivo location of the bacterium (Kadioglu et al., 2008). The presence of pneumococcal polysaccharide capsule, which inhibits opsonophagocytosis, is an important virulence factor. There are currently 93 known capsular serotypes of S. pneumoniae. Invasive S. pneumoniae infections are caused virtually exclusive by encapsulated strains. The majority of pneumococcal nasopharygeal isolates are also encapsulated. However, pneumococci colonizing the nasopharynx phenotypically show reduced polysaccharide capsule expression compared to pneumococci causing invasive disease (Kim & Weiser, 1998). Moreover, up to 18% of pneumococcal nasopharygeal isolates are nonserotypeable, and up to 15% of pneumococcal nasopharygeal isolates are truly nonencapsulated and lack the genes encoding the enzymes required for capsule synthesis.