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简介：AbstractInfection of humans by Powassan virus (POWV) occurs rarely but is potentially life-threatening. First isolated in Ontario, Canada in 1958, the presence of POWV has been confirmed in three countries: Canada, the USA, and Russia. Although a limited number of human cases has been reported thus far, the infection rate has shown signs of increasing during the 21st century. Interestingly, POWV and a genetically close variant, deer tick virus (DTV), are the only member of the tick-borne flaviviruses known to be endemic in North America and maintain in respective tick-host cycles. In this review, we briefly summarize current knowledge involving the epidemiology and etiology, pathogenesis and immunity, molecular evolution, and protein functions of POWV, aiming to increase our understanding of the virus and unlock the potential to control this lethal pathogen. These data may also provide tools to minimize the future threat of other emerging and re-emerging viruses.

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简介：SincetheoutbreakofaSARSepidemiclastyear,significantadvanceshavebeenmadeonourunderstandingofthemechanismsofinteractionbetweentheSARScoronavirus(CoV)andtheimmunesystem.StronghumoralresponseshavebeenfoundinmostpatientsfollowingSARS-CoVinfection,withhightitersofneutralizingAbspresentintheirconvalescentsera.Thenucleocapsid(N)andspike(S)proteinsofSARS-CoVappeartobethedominantantigensrecognizedbyserumAbs.CD4+TcellresponsesagainsttheNproteinhavebeenobservedinSARSpatientsandanHLA-A2-restrictedcytotoxicTlymphocyteepitopeintheSproteinhasbeenidentified.ItislikelythattheimmuneresponsesinducedbySARS-CoVinfectioncouldalsocausepathologicaldamagetothehost,especiallyinthecaseofproinflammatorycytokines.ThereisalsoevidencesuggestingthatSARS-CoVmightbeabletodirectlyinvadecellsoftheimmunesystem.OurunderstandingontheinteractionbetweenSARS-CoV,theimmunesystemandlocaltissuesisessentialtofuturediagnosis,controlandtreatmentofthisverycontagiousdisease.

简介：AbstractAntimicrobial resistance leads to failure of clinical antimicrobial therapy, and has raised urgent global public health concern. Humans can acquire antimicrobial resistance from drugs through the food chain or the environment (contaminated water, air, soil, or manure). While antimicrobials have been regular supplements in animal feed that maintain health and improve productivity of livestock, their over-use in feeding forage has led to a rise in antibacterial resistance. This review summarizes the current use of antimicrobials in livestock, the harmful effects of antimicrobial resistance, and the comprehensive combat measures.

简介：导读：人也可以像蜘蛛侠一样爬墙了!

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简介：AbstractBackground:The prevalence of human brucellosis in Qinghai Province of China has been increasing rapidly, with confirmed cases distributed across 31 counties. However, the epidemiology of brucellosis transmission has not been fully elucidated. To characterize the infecting strains isolated from humans, multiple-locus variable-number tandem repeats analysis (MLVA) and whole-genome single-nucleotide polymorphism (SNP)-based approaches were employed.Methods:Strains were isolated from two males blood cultures that were confirmed Brucella melitensis positive following biotyping and MLVA. Genomic DNA was extracted from these two strains, and whole-genome sequencing was performed. Next, SNP-based phylogenetic analysis was performed to compare the two strains to 94 B. melitensis strains (complete genome and draft genome) retrieved from online databases.Results:The two Brucella isolates were identified as B. melitensis biovar 3 (QH2019001 and QH2019005) following conventional biotyping and were found to have differences in their variable number tandem repeats (VNTRs) using MLVA-16. Phylogenetic examination assigned the 96 strains to five genotype groups, with QH2019001 and QH2019005 assigned to the same group, but different subgroups. Moreover, the QH2019005 strain was assigned to a new subgenotype, IIj, within genotype II. These findings were then combined to determine the geographic origin of the two Brucella strains.Conclusions:Utilizing a whole-genome SNP-based approach enabled differences between the two B. melitensis strains to be more clearly resolved, and facilitated the elucidation of their different evolutionary histories. This approach also revealed that QH2019005 is a member of a new subgenotype (IIj) with an ancient origin in the eastern Mediterranean Sea.

简介：AbstractColistin is an old antimicrobial that has been revitalized as last-resort treatment against multidrug-resistant (MDR) gram-negative bacterial infections. However, colistin has been widely used in agricultural production and veterinary medicine for decades, and the recent global dissemination of mobilized colistin resistance (mcr) genes from animals to humans seriously threats the clinical use of colistin. Most of the mcr-harboring isolates have been Enterobacteriaceae, such as Escherichia coli and Salmonella enterica which are common to animals and humans. An understanding of the origin, dissemination and transmission of mcr genes in bacteria common to animals and humans will facilitate the management of colistin use and relevant interventions to prevent further spread of resistance. This review aims to provide a comprehensive assessment of the global prevalence and transmission of mcr genes of animal and human commensal/pathogenic bacteria.

简介：AbstractIron is an essential trace element for both humans and bacteria. It plays a vital role in life, such as in redox reactions and electron transport. Strict regulatory mechanisms are necessary to maintain iron homeostasis because both excess and insufficient iron are harmful to life. Competition for iron is a war between humans and bacteria. To grow, reproduce, colonize, and successfully cause infection, pathogens have evolved various mechanisms for iron uptake from humans, principally Fe3+-siderophore and Fe2+-heme transport systems. Humans have many innate immune mechanisms that regulate the distribution of iron and inhibit bacterial iron uptake to help resist bacterial invasion and colonization. Meanwhile, researchers have invented detection test strips and coupled antibiotics with siderophores to create tools that take advantage of this battle for iron, to help eliminate pathogens. In this review, we summarize bacterial and human iron metabolism, competition for iron between humans and bacteria, siderophore sensors, antibiotics coupled with siderophores, and related phenomena. We also discuss how competition for iron can be used for diagnosis and treatment of infection in the future.

简介：摘要ObjectiveBecause the reliability of repetitive transcranial magnetic stimulation (rTMS) in treating poststroke cognitive impairment has not been convincingly demonstrated, we systematically examined the effectiveness of this regimen with 2 protocols.MethodsWe randomly allocated 41 patients with poststroke cognitive impairment to receive 5 Hz rTMS (n＝11), intermittent theta burst stimulation (iTBS; n＝15) or sham stimulation (n＝15). Each group received 10 stimulation sessions over the left dorsolateral prefrontal cortex. We performed the Repeatable Battery for the Assessment of Neuropsychological Status (RBANS) and the Beck Depression Inventory at baseline and after the intervention.ResultsThe 5 Hz rTMS group showed significantly greater improvement than the sham group in RBANS total score (P＝0.006), attention (P＝0.001) and delayed memory (P<0.001). The iTBS group showed significantly greater improvement than the sham group in RBANS total score (P＝0.005) and delayed memory (P＝0.007). The 5 Hz rTMS group exhibited a superior modulating effect in attention compared to the iTBS group (P＝0.016). Patients without comorbid hypertension (P＝0.008) were predisposed to favourable therapeutic outcomes.ConclusionsOur results demonstrated that both 5 Hz rTMS and iTBS were effective for poststroke cognitive impairment in terms of global cognition, attention and memory function; the domain of attention was susceptible to 5 Hz modulation. Treatment with 5 Hz rTMS may slow cognitive decline, representing both a pivotal process in poststroke cognitive impairment and an aspect of neuroplasticity that contributes to disease-modifying strategies.

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