, 2010). To our knowledge, this is the first study to demonstrate, in sensitized female rats, differences in NAcc DA availability in response to AMPH that are mediated by levels of E2. It is also the first to show that antipsychotic treatment efficacy does not decrease in female rats when administered chronically at a lower dose. The authors have no conflict of interest to declare. This work was supported by a grant to W.G.B. from the Natural Sciences and Engineering Research Council (NSERC) of Canada. The Center for Studies in Behavioral Neurobiology (CSBN) is a

‘group de recherche’ funded by the Fonds DMXAA concentration de Recherche Quèbec–Santé. We would like to thank Marie-Pierre Cossette for her technical assistance with microdialysis. Abbreviations AMPH D-amphetamine sulphate D2R dopamine D2 receptor BIBW2992 DA dopamine DOPAC dihydroxyphenylacetic acid E2 estradiol HAL haloperidol HE high E2 replacement with HAL He low E2 replacement with HAL HPLC high performance liquid chromatography HVA

homovanillic acid IP intraperitoneally NAcc nucleus accumbens NON non-sensitized group OVX ovariectomized SAL saline SE high E2 replacement with SAL Se low E2 replacement with SAL SEN sensitized group “
“We read with interest the article ‘Epidemiological characterization of Streptococcus pyogenes isolated from patients with multiple onsets of pharyngitis’ by Ogawa et al. (2011). The authors address the important issue of recurrent S. pyogenes throat infections, and they suggest that recurrence and re-infection are often confused. The

authors also investigate the resistance of the 94 isolates studied to several antibiotics. To our surprise, two S. pyogenes isolates resistant to penicillin G were identified (Ogawa et al., 2011). To our knowledge, there is no previous report of S. pyogenes resistance to penicillin. The universal sensitivity of the bacterium to penicillin is fundamental for the choice of treatment against infections with S. pyogenes. Mannose-binding protein-associated serine protease If there indeed are two penicillin-resistant S. pyogenes isolates in the material described by Ogawa and coworkers, this is very alarming and it should be reported to the scientific community. A detailed characterization of the two putatively resistant isolates is needed to evaluate whether they are S. pyogenes and if so, the mechanism of resistance needs to be elucidated. “
“University of Calgary, Veterinary Medicine, Calgary, Canada Two DNA-based methods were compared for the ability to assign serotype to 139 isolates of Salmonella enterica ssp. I. Intergenic sequence ribotyping (ISR) evaluated single nucleotide polymorphisms occurring in a 5S ribosomal gene region and flanking sequences bordering the gene dkgB. A DNA microarray hybridization method that assessed the presence and the absence of sets of genes was the second method. Serotype was assigned for 128 (92.1%) of submissions by the two DNA methods.