China ; Hemorrhagic Fever with Renal Syndrome ; Humans ; Prevalence ; Vaccination

This study was aimed to choose the best fixing method of electrocardiogram (ECG) measurement in mice by comparison of ECG index in three different fixing ways. Changes of ST amplitude and heart rate in ECG were measured in the self-made mouse sets, tape bundling or breathing anesthesia state. The amplitudes of the ST seg-ment in C57BL6 mice and β1/β2-AR double knockout mice were elevated in tape bundling or breathing anesthesia state in comparison with that in the self-made mouse sets (all P < 0.01). The heart rate under the tape bundling state in C57BL6 mice was significantly faster than that in the self-made mouse sets (P< 0.05 or P< 0.01). And the heart rate under anesthesia in β1/β2-AR double knockout mice was significantly slower than that in tape bundling state or the self-made mouse sets (both P < 0.01). It was concluded that relative to the binding and anesthesia method, fixing mouse in the self-made mouse sets, which can more truly reflect the physiological or pathological states, is a relatively good fixing method of ECG measurement in experimental study.

Objective To analyze the clinical data of brucellosis,and to provide references for brucellosis therapy.Methods The patients definitely diagnosed brucellosis at the First Affiliated Hospital of Zhengzhou University from January 2013 to June 2016 were assessed,data of clinical features,laboratory examination,treatment and prognosis were analyzed.Results Of all 99 cases,the mean age was (46.7 ± 15.7) years old,83 cases had a history of closely contacted with sheep,2 cases with pig and 1 case with cattle.The occupational distribution of patients included 90 farmers,1 veterinarian,2 cooks,6 children and students.All patients had clinical manifestations such as fever,fatigue,and sweating.There were 18 patients with back and joint pain,13 cases had abnormal manifestation on magnetic resonance imaging (MRI).Blood culture was positive in 54 (71.05％,54/76) and serum test tube agglutination test was positive in 61 (98.39％,61/62).Eighty-one patients received doxycycline combined with rifampicin treatment,six months laters,all patients were cured.Conclusions Sheep are the main sources of infection for brucellosis.Fatigue,sweaty and fever are the most common symptoms,and osteoarticular is the most frequently involved.Serum agglutination test and blood culture are important tests for diagnosis of brucellosis.Doxycycline combined with rifampicin was the most common used antibiotics regimen.Early,combined,regular,full-course antibiotic treatment has a better prognosis.

Objective To evaluate the application value of identification on drown by detection 16SrDNA of the diatoms in rabbits' internal organs in summer month of July and winter month of December in YongJiang River of Ningbo. Methods 60 Rabbits were randomly and medially divided into three groups in summer and winter: drowning group, postmortem immersion group and using only lethal aeroembolism as control group. Specimen including heart, liver, lung and kidney from each rabbit were tested with diatom 16SrDNA PCR method. Results Compared with postmortem immersion group, detection rate of diatom 16SrDNA of heart, liver, lung, renal tissue in drowning group was significantly higher than that in summer month of July (P<0.05), In December, the 16SrDNA of the drowning group was detected in heart and lung tissues, There was no significant difference compared with postmortem immersion group (P>0.05) In summer month of July, detection rate of 16SrDNA of heart, liver, lung, renal tissues in drowning group was significantly higher than that in winter month of December (P<0.05). Diatom 16SrDNA of heart, liver, lung, kidney tissues in air embolism group were not detected In summer month of July and winter month of December. Conclusion With the higher detection rate of diatom 16SrDNA in drowning rabbit in summer, the diatom 16SrDNA PCR method can be used for the diagnosis of drowning in Yongjiang River of Ningbo; while in winter , it should be carefully apllied with the lower detection rate of diatom 16SrDNA.

BACKGROUND: Scleroderma is a multisystem disease in which tissue fibrosis is caused by inflammation and vascular damage. The mortality of scleroderma has remained high due to a lack of effective treatments. However, exosomes derived from human umbilical cord mesenchymal stem cells (HUMSCs)-Ex have been regarded as potential treatments for various autoimmune diseases, and may also act as candidates for treating scleroderma. METHODS: Mice with scleroderma received a single 50 lg HUMSCs-Ex. HUMSCs-Ex was characterized using transmission electron microscopy, nanoparticle tracking analysis and nanoflow cytometry. The therapeutic efficacy was assessed using histopathology, immunohistochemistry, immunofluorescence, quantitative real-time polymerase chain reaction, enzyme-linked immunosorbent assay and western blot. RESULTS: HUMSCs-Ex ameliorated the deposition of extracellular matrix and suppressed the epithelial-mesenchymal transition process, and the effects lasted at least three weeks. In addition, HUMSCs-Ex promoted M1 macrophage polarization and inhibited M2 macrophage polarization, leading to the restoration of the balance of M1/M2 macrophages. CONCLUSION We investigated the potential antifibrotic and anti-inflammatory effects of HUMSCs-Ex in a bleomycininduced mouse model of scleroderma. So HUMSCs-Ex could be considered as a candidate therapy for scleroderma.

Objective: To analyze the epidemiological characteristics and the molecular types of human adenovirus (HAdV) from influenza-like illness (ILI) samples with negative influenza virus in Xi'an from January 2013 to December 2015. Methods: Samples from patients with ILI were collected from two national influenza sentinel surveillance hospitals during 2013—2015 in Xi′an. HAdV was detected by real-time PCR, and then the positive samples were inoculated into Hep-2 cells to isolate the viruses. The amplified products were purified and sequenced of hexon gene, and the sequences were compared with the Genebank data and phylogenetic trees were constructed. Results: In 2367 samples, 88 samples were positive for HAdV, the positive rate was 3.72%. There were 7 subtypes detected, and the rates of each subtype are as follows: HAdV-1 was 9.09%, HAdV-2 was 22.73%, HAdV-3 was 23.86%, HAdV-4 was 5.68%, HAdV-5 was 7.95%, HAdV-6 was 3.41% and HAdV-7 was 1.14%. Males had higher infection rate than females, but there was no significant difference. The patients were divided into 6 groups according to age. There were 3 positive samples among those under 1 year of age, 36 positive samples among those 1 to 3 years old, 26 positive samples among those 4 to 6 years old, 16 positive samples in those 7 to 18 years old, 5 positive samples in 19 to 59 years old and 2 positive samples in those older than sixty years of age. HAdV infection was primarily confined to children under 7 years of age. Conclusions HAdV-3 and HAdV-2 were the dominant epidemic strains during 2013—2015 in Xi′an. Children younger than 7 years were the main susceptible population. HAdV infections circulate all year-round and there was no considerable seasonal variation.

Bacteremia induced by periodontal infection is an important factor for periodontitis to threaten general health. P. gingivalis DNA/virulence factors have been found in the brain tissues from patients with Alzheimer's disease (AD). The blood-brain barrier (BBB) is essential for keeping toxic substances from entering brain tissues. However, the effect of P. gingivalis bacteremia on BBB permeability and its underlying mechanism remains unclear. In the present study, rats were injected by tail vein with P. gingivalis three times a week for eight weeks to induce bacteremia. An in vitro BBB model infected with P. gingivalis was also established. We found that the infiltration of Evans blue dye and Albumin protein deposition in the rat brain tissues were increased in the rat brain tissues with P. gingivalis bacteremia and P. gingivalis could pass through the in vitro BBB model. Caveolae were detected after P. gingivalis infection in BMECs both in vivo and in vitro. Caveolin-1 (Cav-1) expression was enhanced after P. gingivalis infection. Downregulation of Cav-1 rescued P. gingivalis-enhanced BMECs permeability. We further found P. gingivalis-gingipain could be colocalized with Cav-1 and the strong hydrogen bonding between Cav-1 and arg-specific-gingipain (RgpA) were detected. Moreover, P. gingivalis significantly inhibited the major facilitator superfamily domain containing 2a (Mfsd2a) expression. Mfsd2a overexpression reversed P. gingivalis-increased BMECs permeability and Cav-1 expression. These results revealed that Mfsd2a/Cav-1 mediated transcytosis is a key pathway governing BBB BMECs permeability induced by P. gingivalis, which may contribute to P. gingivalis/virulence factors entrance and the subsequent neurological impairments.
Animals ; Rats ; Bacteremia/metabolism* ; Blood-Brain Barrier/microbiology* ; Caveolin 1/metabolism* ; Gingipain Cysteine Endopeptidases/metabolism* ; Permeability ; Porphyromonas gingivalis/pathogenicity* ; Transcytosis ; Virulence Factors/metabolism*