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简介：AbstractEbola virus (EBOV) is one of the most pathogenic viruses in humans which can cause a lethal hemorrhagic fever. Understanding the cellular entry mechanisms of EBOV can promote the development of new therapeutic strategies to control virus replication and spread. It has been known that EBOV virions bind to factors expressed at the host cell surface. Subsequently, the virions are internalized by a macropinocytosis-like process, followed by being trafficked through early and late endosomes. Recent researches indicate that the entry of EBOV into cells requires integrated and functional lipid rafts. Whilst lipid rafts have been hypothesized to play a role in virus entry, there is a current lack of supporting data. One major technical hurdle is the lack of effective approaches for observing viral entry. To provide evidence on the involvement of lipid rafts in the entry process of EBOV, we generated the fluorescently labeled Ebola virus like particles (VLPs), and utilized single-particle tracking (SPT) to visualize the entry of fluorescent Ebola VLPs in live cells and the interaction of Ebola VLPs with lipid rafts. In this study, we demonstrate the compartmentalization of Ebola VLPs in lipid rafts during entry process, and inform the essential function of lipid rafts for the entry of Ebola virus. As such, our study provides evidence to show that the raft integrity is critical for Ebola virus pathogenesis and that lipid rafts can serve as potential targets for the development of novel therapeutic strategies.

简介：AbstractFoot-and-mouth disease virus (FMDV), swine vesicular disease virus (SVDV) and classical swine fever virus (CSFV) all cause important animal diseases. FMDV affects many different cloven-hoofed animals, whereas SVDV and CSFV are restricted to domestic and feral pigs together with wild boar. Europe is normally free of these diseases, but occasionally outbreaks happen, which can cause huge economic losses. Handling of these viruses, in particular FMDV and CSFV, is only allowed within high containment laboratories and stables. Periodically such facilities need to be decommissioned for repair or closing down, which is done by cleaning and chemical disinfection, followed by fumigation due to residual risk from virus on surfaces in inaccessible places. However, building materials in older laboratories or stables that have housed infected animals may not be well-suited for fumigation. Heat treatment is another way of inactivating viruses. In this study, we have determined the survival of infectivity in air-dried virus samples on glass and plastic surfaces incubated at room temperature or heated to 70 °C for 1, 2, 3, 5 and 7 days. Each of the tested viruses was inactivated to below the limit of detection after 24 h or 48 h of incubation at 70 °C; in contrast, some of these viruses were still infectious after 7 days of incubation at room temperature. This study provides important information that can be used in relation to decontamination of buildings and in risk-assessments.

简介：AbstractThis paper reviews the current epidemics of human immunodeficiency virus (HIV) infection in China, particularly the globally available prevention strategies developed and implemented. This review focuses on HIV prevention measures in general, such as education, testing, and counseling and in specific responses to transmission modes, such as blood safety, harm reduction for people who inject drugs, and condom promotion to reduce sexual transmission. We also assess newly developed prevention measures, such as prevention treatment, pre-exposure prophylaxis, post-exposure prophylaxis, male circumcision, and promising potential future preventions, including microbicides and vaccines. Based on this assessment, we provide recommendations for their implementation in China. We conclude that there is no magic bullet for HIV prevention, particularly sexual transmission of the disease, but only a combination of these prevention strategies can control the HIV epidemic.

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.

简介：AbstractAnti-influenza drugs are one of the most critical pathways for control of influenza virus infection. Drugs that have been developed or are developing may function via different mechanisms, and so far, inhibitors of influenza virus polymerase are among the most promising types of drugs. Favipiravir and Baloxavir, also named T-705 and Xofluza respectively, have been approved for influenza treatment in Japan and the United States. Favipiravir effectively and selectively inhibits the RNA-dependent RNA polymerase (RdRp) of RNA viruses while Baloxavir specifically targets the cap-dependent endonuclease PA of influenza viruses. These two drugs have been suggested as the first candidate drugs for influenza infection treatment, especially for strains resistant to other anti-influenza drugs. This review will focus on the pharmaceutical mechanisms and anti-influenza activity of these two drugs.

简介：AbstractChronic hepatitis B virus (HBV) infection due to vertical transmission remains a critical concern with regards to eliminating HBV infection. Implementation of hepatitis B vaccine, the foundation to prevent perinatal and horizontal transmission, has reduced the prevalence of HBV by >80%. In countries where the hepatitis B immune globulin (HBIG) is available, such as China and the United States, the administration of HBIG and hepatitis B vaccine to the infants of mothers who are positive for hepatitis B surface antigen has become a standard practice and is effective in preventing vertical transmission. Accumulating evidence on the efficacy and safety of antiviral prophylaxis during pregnancy indicates the probability of attaining the goal of the World Health Organization to eliminate hepatitis by 2030. In this review, we discuss the transmission routes, diagnostic criteria, and preventive strategies for vertical transmission. A preventive program that includes screening before pregnancy, antiviral prophylaxis during pregnancy, and postpartum immunoprophylaxis provides "perfect strategies" to eliminate vertical transmission. However, there is still a notable gap between "perfect strategies" and real-world application, including insufficient coverage of timely birth dose vaccine and the efficacy and necessity of HBIG, especially in mothers who are negative for hepatitis B envelope antigen. In particular, there is a clear need for a comprehensive long-term safety profile of antiviral prophylaxis. Therefore, feasible and cost-effective preventive strategies need to be determined across regions. Access also needs to be scaled up to meet the demands for prophylaxis and prevalence targets.

简介：AbstractRecently, death from herpes B virus (Cercopithecine Herpesvirus 1) infection was reported in China, reminding us to be alert to the risk of transmission and infection with herpes B virus. Herpes B virus is a zoonotic pathogen that can cause fatal encephalomyelitis in humans. The virus naturally infects rhesus monkeys, causing diseases like human herpes simplex virus (HSV) infection, which are often asymptomatic or mild in the rhesus macaque. However, herpes B virus infection can be fatal to humans. Without timely treatment, the mortality rate of herpes B virus infection is as high as 70%-80%. To date, approximately 50 cases of human herpes B virus (HBV) infection have been reported worldwide. Most cases are related to direct contact with macaques, such as scratching, biting, or mucosal contact with monkey body fluids or secretions. Although the risk of human-to-human transmission is low, the widespread prevalence of the virus among monkeys, the high mortality of infected persons, and the severe neurological sequelae of survivors render this virus an important zoonotic pathogen that threatens human beings. Biorisk-related training programs for at risk personnel and timely treatment after exposure to the B virus can reduce infection rate and mortality. The early initiation of antiviral therapy prevents severe disease or death after the rapid diagnosis of human B virus disease. Identification of risk factors is essential in controlling the spread of the herpes B virus in the population at risk.

简介：AbstractChronic hepatitis B virus (HBV) infection is a serious health issue because of its severe sequelae. Prevention of mother-to-child transmission (MTCT) of HBV is critical to eliminate chronic HBV infection. Here, we reviewed the progress toward the elimination of HBV infection in children in China in the recent decade. A universal hepatitis B vaccination program started from 2002 has been intensified, with the coverage of timely birth dose >95% of all newborn infants from 2012. Since 2011, China has taken a nationwide program to administer hepatitis B immunoglobulin (HBIG) with free of charge in all neonates of HBV-infected mothers, leading to a significant increment of timely use of HBIG. The prevalence of hepatitis B surface antigen (HBsAg) was declined from around 10% among children in 1980s to <0.5% among children born after 2011. Administration of oral antiviral agents in HBV-infected pregnant women with HBV DNA >2 × 105 U/mL during the third trimester is increasing, which will further reduce MTCT of HBV. However, there are some challenges in the elimination of HBV infection in children, which need to overcome by the concerted efforts. Nevertheless, it is anticipated that China will achieve the goal set by the World Health Organization that the prevalence of HBsAg in children aged <5 years is ≤0.1% by 2030.

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简介：AbstractZika virus (ZIKV) may cause severe microcephaly in newborn babies and Guillain-Barré syndrome in some adults. In recent decades, its range has expanded in 86 countries. There are two ecologically and evolutionarily district cycles: urban cycle and sylvatic cycle. This work aimed to estimate the urban and sylvatic cycle areas of ZIKV throughout the world. The occurrence records of vectors, non-human primate hosts, and ZIKV were collected. We chose historical climate data, predicted vectors distribution, human population density, and elevation data as the variables to fit the maximum entropy model (MaxEnt). Current risk area and future prediction were performed with global climate models (GCMs) and shared socioeconomic pathways (SSPs). Predicting the ZIKV risk area would help tailor related control strategies. The results indicated that 16.6% of the world’s landmass (except Antarctica) is a risk area in the urban cycle. Approximately 6.22 billion people (78.69% of the global population) live in the risk area, with the vast majority in South Asia, tropical Africa, South America, North America, and countries around the Mediterranean Sea. Future climate change decreases the risk area of ZIKV. This study also suggested that the sylvatic cycle happened between the Tropic of Cancer and the Tropic of Capricorn. The overlap region of the urban and sylvatic cycles could be hotpots that ZIKV spill from the sylvatic to the urban cycle. It is indicated that long-term passenger screening, mosquito surveillance, and control are necessary.

简介：AbstractViral isolation in cell cultures has been regarded for decades as the "gold standard" for the laboratory diagnosis of influenza viral infections. Not all viral strains could be isolated from clinical samples. This study aimed to quantify the viral load in the samples before isolation to save working time and improve working efficiency. Four hundred samples from patients with influenza-like cases were confirmed pdmH1N1 positive (200 cases) and B Victoria (BV) positive (200 cases) by whole-genome sequencing and analyzed by ddPCR for viral load in samples before isolation, and isolation results were verified by hemagglutination (HA) assay and hemagglutination-inhibition (HI) tests. Probit regression analysis was used to calculate the isolation viral load limit with a 95% probability level by SPSS 19.0 software. The results showed that the isolation limit of viral load was 4.9 × 104 (95% CI: 2.5 × 104-9.0 × 104) copies/mL for pdmH1N1 and 1.9 × 104 (95% CI: 7.8 × 103-3.6 × 104) copies/mL for BV. The isolation rate of clinical samples is positively correlated with the viral load in clinical samples, which can be used for viral culture, providing important guidance for daily work.

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简介：AbstractAvian influenza remains a threat to human wellbeing. Hypochlorite derivatives are commonly used as disinfectants to prevent the spread of the disease. The World Health Organization (WHO) has listed chlorine dioxide (ClO2) as an A1-level, safe, and efficient disinfectant. In this study, we tested the efficacy of ClO2, in aqueous solution and gas forms, against avian influenza A (H7N9) virus. The virus suspension was mixed with ClO2 aqueous solutions of various concentrations and for various time intervals. Aliquots of the mixture were then serially diluted, and the 50% tissue culture infective dose (TCID50) was measured with a hemagglutination test on MDCK cells. ClO2 gas produced from generators was introduced in a chamber containing the virus suspension in a Petri dish. The infective activity of the surviving virus was measured by the hemagglutination test. An aqueous solution of ClO2 at 126 µg/mL for 15 s was effective given that no surviving virus was detected with the hemagglutination test. ClO2 gas at >5 µL/L sustained for 1 h inactivated the virus effectively, while at 2.5 µL/L for 1 h, it only partially inactivated the virus. ClO2 as gas or aqueous solution at a certain concentration is effective in inactivating the H7N9 virus, and can be applied for the decontamination and disinfection of environments.