Genomic Epidemiology of ST34 Monophasic Salmonella enterica Serovar Typhimurium from Clinical Patients from 2008 to 2017 in Henan,China

Salmonella enterica serovar 4,[5],12:i:-(S.4,[5],12:i:-)is a monophasic variant of Salmonella enterica serovar Typhimurium that has emerged as a global serovar causing public health concern.To date,the epidemiology and genomic characterization of this pathogen in China have not been well described.We investigated the prevalence,antimicrobial resistance(AMR)phenotypes,and population genomics of sequence type 34(ST34)S.4,[5],12:i:-among cases of human salmonellosis in Henan Province,China.A total of 100 ST34 S.4,[5],12:i:-isolates were studied from 2008 to 2017 and found mostly resistant to ampicillin(AMP),streptomycin(STR),sulfonamides(SUL),and tetracycline(TET)(ASSu T).Bayesian phylogenetic analysis demonstrated that isolates identified in China were mostly related to the European lineage and evolved into two major clades with different resistance genes and plasmid profiles.Notably,clade 1 showed a significantly higher rate of mutations in gyr A and plasmid-mediated quinolone resistance genes.The carrying of the resistance-containing region(encoding R-type ASSu T),including bla(conferring resistance to AMP),str AB(STR),sul2(SUL),and tet(B)(TET)inserted into the flj BA operon,was responsible for most of the monophasic variants in clade 2.Inc HI2 plasmids were the dominant multi-drug resistance mobile genetic elements accounting for the transmission of acquired resistance genes in this serovar,and these were more prevalent in clade 1.Our findings highlighted the increasing prevalence of multi-drug resistant S.4,[5],12:i:-in China,along with the differential characteristics of resistance gene acquisition among various lineages.Based on our data,control measures are required to address the spread of this zoonotic pathogen.Further owing to its potential origin in food-producing animals,a"One Health"approach,should be implemented to support surveillance whilst informing interventional strategies.

Effect of Bushen Yisui Capsule(补肾益髓胶囊) on Oligodendrocyte Lineage Genes 1 and 2 in Mice with Experimental Autoimmune Encephalomyelitis

Objective： To study the effects of Bushen Yisui Capsule（补肾益髓胶囊, BSYSC） on the oligodendrocyte lineage genes（Olig） 1 and Olig2 in C57BL/6 mice with experimental autoimmune encephalomyelitis（EAE） in order to explore the remyelination effect of BSYSC. Methods： The mice were randomly divided into normal control（NC）, EAE model（EAE-M）, prednisone acetate（PA, 6 mg/kg）, BSYSC high-dose（3.02 g/kg） and BSYSC low-dose（1.51 g/kg） groups. The mice were induced by immunization with myelin oligodendrocyte glycoprotein（MOG） 35-55. The neurological function scores were assessed once daily. The pathological changes in mice brains were observed with hematoxylin-eosin（HE） staining and transmission electron microscope（TEM）. The protein expressions of myelin basic protein（MBP）, Olig1 and Olig2 in brains were measured by immunohistochemistry. The m RNA expressions of Olig1 and Olig 2 was also determined by quantitative real-time polymerase chain reaction. Results： Compared with the EAE-M mice,（1） the neurological function scores were significantly decreased in BSYSC-treated mice on days 22 to 40（P〈0.01）;（2） the inflammatory cells and demyelination in brains were reduced in BSYSC-treated EAE mice;（3） the protein expression of MBP was markedly increased in BSYSC-treated groups on day 18 and 40 respectively（P〈0.05 or P〈0.01）;（4） the protein expression of Olig1 was increased in BSYSC（3.02 g/kg）-treated EAE mice on day 40（P〈0.01）. Protein and m RNA expression of Olig2 was increased in BSYSC-treated EAE mice on day 18 and 40（P〈0.01）. Conclusion： The effects of BSYSC on reducing demyelination and promoting remyelination might be associated with the increase of Olig1 and Olig2.