Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 4.390
Filtrar
1.
Texto & contexto enferm ; 29: e20180517, Jan.-Dec. 2020.
Artigo em Inglês | LILACS, BDENF - Enfermagem | ID: biblio-1094554

RESUMO

ABSTRACT Objective: to know how mothers affected by the Zika virus during pregnancy became aware on the diagnosis of Congenital Zika Virus Syndrome in their child and to understand the way in which the communication of the diagnosis was transmitted. Method: a qualitative approach study, with interpretative research, based on the Resilience, Stress, Adjustment and Family Adaptation Model. The research was conducted in a Specialized Rehabilitation Center in a city of Paraíba (Brazil), from June to November 2017, with 40 mothers of children with congenital Zika virus syndrome. The empirical material was produced from a semi-structured script developed by the researcher, related to the different phases and components of the adaptation and resilience process. The findings were submitted to content analysis. Results: two thematic categories were unveiled: The discovery of Congenital Zika Virus Syndrome: period of diagnosis and maternal expectations, and How to communicate the diagnosis: implications for the discovery of Congenital Zika Virus Syndrome. Conclusion: Communication of the diagnosis and professional conduct at the time of information play important roles in re-signifying the meaning of congenital malformation. The interaction established by the health professional and their posture are directly related to the satisfaction about the information received.


RESUMEN Objetivos: conocer de qué manera las madres afectadas por el virus del Zika se enteraron del diagnóstico del Síndrome Congénito del Virus del Zika en sus hijos, y determinar cómo se comunicó el diagnóstico. Método: estudio de enfoque cualitativo, con investigación interpretativa, fundamentado en el Modelo de Resiliencia, Estrés, Ajustes y Adaptación Familiar. La investigación se realizó en un Centro Especializado en Rehabilitación de un municipio da Paraíba (Brasil) entre junio y noviembre de 2017 con 40 madres de niños con el Síndrome Congénito del Virus del Zika. El material empírico se produjo a partir de un guión con carácter semiestructurado desarrollado por la investigadora, relacionado con las diferentes fases y componentes del proceso de adaptación y resiliencia. Los hallazgos se sometieron a análisis de contenido. Resultados: surgieron dos categorías temáticas: La detección del Síndrome Congénito del Virus del Zika: período del diagnóstico y expectativas maternas, y Cómo comunicar el diagnóstico: implicancias al momento de detectar el Síndrome Congénito del Virus del Zika. Conclusión: comunicar el diagnóstico y la conducta profesional al momento de dar la noticia tienen un peso importante en la resignificación del sentido de la malformación congénita. La interacción que establece el profesional de la salud y su postura están directamente relacionadas con el nivel de satisfacción con respecto a la información recibida.


RESUMO Objetivo: conhecer como as mães acometidas pelo Zika vírus na gestação souberam do diagnóstico da Síndrome Congênita do Zika vírus em seu(sua) filho(a) e apreender a forma com que a comunicação do diagnóstico foi transmitida. Método: estudo de abordagem qualitativa, com investigação interpretativa, fundamentado no Modelo de Resiliência, Estresse, Ajustamento e Adaptação Familiar. A pesquisa foi realizada em um Centro Especializado em Reabilitação de um município da Paraíba (Brasil), no período de junho a novembro de 2017, com 40 mães de crianças com a Síndrome Congênita do Zika vírus. O material empírico foi produzido a partir de um roteiro com caráter semiestruturado desenvolvido pela pesquisadora, relacionado com as diferentes fases e componentes do processo de adaptação e resiliência. Os achados foram submetidos à analise de conteúdo. Resultados: foram desveladas duas categorias temáticas: A descoberta da Síndrome Congênita do Zika vírus: período do diagnóstico e expectativas maternas, e A forma da comunicação do diagnóstico: implicações diante da descoberta da Síndrome Congênita do Zika vírus. Conclusão: a comunicação do diagnóstico e a conduta profissional no momento da informação possuem papéis importantes na ressignificação do sentido da malformação congênita. A interação estabelecida pelo profissional de saúde e sua postura estão diretamente relacionadas com a satisfação sobre a informação recebida.


Assuntos
Humanos , Feminino , Saúde da Mulher , Zika virus , Microcefalia , Mães , Sistema Único de Saúde , Diagnóstico
2.
Rev Sci Tech ; 39(2): 461-470, 2020 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-33046929

RESUMO

In recent times, there has been an increased focus on animal health and zoonotic diseases that have the potential to trigger epidemics or pandemics that disproportionately affect the poor and most vulnerable. The recent Ebola, Zika and COVID-19 outbreaks demonstrate the devastating human, social and economic impacts of such diseases if they are not prevented or controlled, ideally at source. The risk drivers for zoonoses, which are complex and often interdependent, include climate change and related disasters, antimicrobial resistance, and anthropogenic drivers such as land-use changes and animal production practices. Understanding these drivers requires a better understanding of the ecology of zoonotic diseases at the human-animal-environment interface. Biosecurity and biosafety are critical for reducing the risk of accidental or deliberate release and should be included in risk management strategies. International frameworks for sustainable development, climate change, and disaster risk reduction have all integrated health as one of the core areas of work, calling for better preparedness and response to biological hazards and increased health system resilience. To improve their ability to prevent, prepare for, and respond to emerging and re-emerging threats, countries should address these risk drivers, taking a multidisciplinary One Health approach that involves the animal and human health and environment sectors. Cross-border cooperation is also vital, as diseases know no boundaries.


Assuntos
Infecções por Coronavirus , Desastres , Pandemias , Pneumonia Viral , Infecção por Zika virus , Zika virus , Animais , Betacoronavirus , Mudança Climática , Emergências/veterinária , Humanos , Gestão de Riscos , Infecção por Zika virus/veterinária , Zoonoses/epidemiologia
3.
Artigo em Inglês | MEDLINE | ID: mdl-33027393

RESUMO

The Northeast of Brazil has experienced a triple epidemic, with the simultaneous circulation of dengue virus (DENV), chikungunya virus (CHIKV) and Zika virus (ZIKV), which may have contributed to the observed increase across this region of atypical forms of disease and deaths. In view of this fact, non-congenital neurological disorders related to arboviruses were compared with other etiologies, mortality and survival rates of patients admitted to referral neurology hospitals in Pernambuco State, Northeast Brazil, from 2015 to 2018. Blood and cerebrospinal fluid samples were collected and tested using molecular and serological assays. The arbovirus-exposed groups were compared with respect to epidemiological, clinical and neurologic characteristics by using the Pearson's chi-square test. For the survival analysis, the Kaplan-Meier and Hazard Ratio (HR) tests were used, with a 95% confidence interval (CI). Encephalitis and encephalomyelitis were more frequent in arboviruses, while myelitis predominated in the neurological disorders of other etiologies. Guillain-Barré Syndrome (GBS) was similarly distributed amongst the groups. Exposure to one of the arboviruses caused a six-fold increase in the risk of death (HR: 6.37; CI: 2.91 - 13.9). Amongst the arbovirus-exposed groups, infection (DENV/CHIKV) increased nine times the risk of death (HR: 9.07; CI: 3.67 - 22.4). The survival curve indicates that have been exposed to some arbovirus decreased the likelihood of survival compared to those with other etiologies (Log-Rank: p<0.001). Within this scenario, neurologic manifestations of DENV, CHIKV and ZIKV have the potential to increase mortality and decrease survival, and concomitant infection (DENV/CHIKV) is an aggravating factor in reducing the likelihood of survival when compared to monoinfections.


Assuntos
Febre de Chikungunya/diagnóstico , Vírus da Dengue/isolamento & purificação , Dengue/diagnóstico , Encefalite Viral/epidemiologia , Encefalomielite/virologia , Doenças do Sistema Nervoso/virologia , Infecção por Zika virus/diagnóstico , Zika virus/isolamento & purificação , Adulto , Brasil , Febre de Chikungunya/complicações , Dengue/complicações , Encefalomielite/epidemiologia , Feminino , Humanos , Estimativa de Kaplan-Meier , Masculino , Doenças do Sistema Nervoso/diagnóstico , Análise de Sobrevida , Infecção por Zika virus/complicações
4.
Nat Commun ; 11(1): 4953, 2020 10 02.
Artigo em Inglês | MEDLINE | ID: mdl-33009400

RESUMO

Zika virus (ZIKV) is an emerging mosquito borne flavivirus and a major public health concern causing severe disease. Due to the presence of a lipid membrane and structural heterogeneity, attaining an atomic resolution structure is challenging, but important to understand virus assembly and life cycle mechanisms that offer distinct targets for therapeutic intervention. We here use subvolume refinement to achieve a 3.4 Å resolution structure and identify two distinct lipid moieties. The first arises from the inner leaflet and is coordinated by hydrophobic residues of the M and E transmembrane helices that form a binding pocket not previously characterized. The second lipid arises from the outer leaflet coordinate between two E protein helices. Structure-based mutagenesis identifies critical hydrophobic interactions and their effect on the virus life cycle. Results show that lipids play an essential role in the ZIKV assembly pathway revealing a potential target of lipid based antiviral drug development.


Assuntos
Montagem de Vírus/fisiologia , Zika virus/fisiologia , Animais , Chlorocebus aethiops , Células HEK293 , Humanos , Células Vero , Vírion/ultraestrutura , Zika virus/isolamento & purificação , Zika virus/ultraestrutura
5.
Rev Prat ; 70(3): 329-332, 2020 Mar.
Artigo em Francês | MEDLINE | ID: mdl-32877071

RESUMO

Zika virus infection: what advice in post-epidemic situation? Zika virus transmission is vector-borne, but it can also be sexual. The Zika disease contracted by an adult or child is most often mild but infection of the woman during pregnancy can lead to severe neurological congenital lesions. The Zika virus continues to circulate in many parts of the world. Risk of infection during travel is low but cannot be overlooked. An infected man can be infectious, during sexual intercourse, up to 3 months after contracting the disease. Information of pregnant women and couples with a child project is warranted if at least one of the two trips or has travelled in Zika virus transmission zone. Laboratory serologic tests can be used to determine if the partners have been infected and to verify, through the investigation of the virus in the semen, that there is no risk of sexual transmission.


Assuntos
Epidemias , Complicações Infecciosas na Gravidez , Infecção por Zika virus , Zika virus , Adulto , Criança , Feminino , Humanos , Masculino , Gravidez , Viagem , Infecção por Zika virus/epidemiologia , Infecção por Zika virus/prevenção & controle , Infecção por Zika virus/transmissão
6.
Cells ; 9(9)2020 09 15.
Artigo em Inglês | MEDLINE | ID: mdl-32942671

RESUMO

The small molecule macrocyclic lactone ivermectin, approved by the US Food and Drug Administration for parasitic infections, has received renewed attention in the last eight years due to its apparent exciting potential as an antiviral. It was identified in a high-throughput chemical screen as inhibiting recognition of the nuclear localizing Human Immunodeficiency Virus-1 (HIV-1) integrase protein by the host heterodimeric importin (IMP) α/ß1 complex, and has since been shown to bind directly to IMPα to induce conformational changes that prevent its normal function in mediating nuclear import of key viral and host proteins. Excitingly, cell culture experiments show robust antiviral action towards HIV-1, dengue virus (DENV), Zika virus, West Nile virus, Venezuelan equine encephalitis virus, Chikungunya virus, Pseudorabies virus, adenovirus, and SARS-CoV-2 (COVID-19). Phase III human clinical trials have been completed for DENV, with >50 trials currently in progress worldwide for SARS-CoV-2. This mini-review discusses the case for ivermectin as a host-directed broad-spectrum antiviral agent for a range of viruses, including SARS-CoV-2.


Assuntos
Antivirais/farmacologia , Betacoronavirus/efeitos dos fármacos , Infecções por Coronavirus/tratamento farmacológico , HIV-1/efeitos dos fármacos , Ivermectina/farmacologia , Pneumonia Viral/tratamento farmacológico , Animais , Linhagem Celular , Chlorocebus aethiops , Dengue/tratamento farmacológico , Vírus da Dengue/efeitos dos fármacos , Infecções por HIV/tratamento farmacológico , Integrase de HIV/efeitos dos fármacos , Inibidores de Integrase de HIV/farmacologia , Humanos , Pandemias , Células Vero , Zika virus/efeitos dos fármacos , Infecção por Zika virus/tratamento farmacológico
7.
Sci Adv ; 6(39)2020 09.
Artigo em Inglês | MEDLINE | ID: mdl-32978154

RESUMO

Detection of viruses is critical for controlling disease spread. Recent emerging viral threats, including Zika virus, Ebola virus, and SARS-CoV-2 responsible for coronavirus disease 2019 (COVID-19) highlight the cost and difficulty in responding rapidly. To address these challenges, we develop a platform for low-cost and rapid detection of viral RNA with DNA nanoswitches that mechanically reconfigure in response to specific viruses. Using Zika virus as a model system, we show nonenzymatic detection of viral RNA with selective and multiplexed detection between related viruses and viral strains. For clinical-level sensitivity in biological fluids, we paired the assay with sample preparation using either RNA extraction or isothermal preamplification. Our assay requires minimal laboratory infrastructure and is adaptable to other viruses, as demonstrated by quickly developing DNA nanoswitches to detect SARS-CoV-2 RNA in saliva. Further development and field implementation will improve our ability to detect emergent viral threats and ultimately limit their impact.


Assuntos
Betacoronavirus/genética , Infecções por Coronavirus/diagnóstico , DNA de Cadeia Simples/genética , Eletroforese em Gel de Ágar/métodos , Pneumonia Viral/diagnóstico , RNA Viral/genética , Análise de Sequência de RNA/métodos , Sequência de Bases , Linhagem Celular Tumoral , Infecções por Coronavirus/virologia , Dengue/diagnóstico , Dengue/virologia , Vírus da Dengue/genética , Eletroforese em Gel de Ágar/economia , Humanos , Limite de Detecção , Pandemias , Pneumonia Viral/virologia , Saliva/virologia , Análise de Sequência de RNA/economia , Zika virus/genética , Infecção por Zika virus/diagnóstico , Infecção por Zika virus/virologia
8.
Sci Adv ; 6(35): eaba7910, 2020 08.
Artigo em Inglês | MEDLINE | ID: mdl-32923629

RESUMO

Targeting a universal host protein exploited by most viruses would be a game-changing strategy that offers broad-spectrum solution and rapid pandemic control including the current COVID-19. Here, we found a common YxxØ-motif of multiple viruses that exploits host AP2M1 for intracellular trafficking. A library chemical, N-(p-amylcinnamoyl)anthranilic acid (ACA), was identified to interrupt AP2M1-virus interaction and exhibit potent antiviral efficacy against a number of viruses in vitro and in vivo, including the influenza A viruses (IAVs), Zika virus (ZIKV), human immunodeficiency virus, and coronaviruses including MERS-CoV and SARS-CoV-2. YxxØ mutation, AP2M1 depletion, or disruption by ACA causes incorrect localization of viral proteins, which is exemplified by the failure of nuclear import of IAV nucleoprotein and diminished endoplasmic reticulum localization of ZIKV-NS3 and enterovirus-A71-2C proteins, thereby suppressing viral replication. Our study reveals an evolutionarily conserved mechanism of protein-protein interaction between host and virus that can serve as a broad-spectrum antiviral target.


Assuntos
Proteínas Adaptadoras de Transporte Vesicular/metabolismo , Antivirais/farmacologia , Cinamatos/farmacologia , Infecções por Coronavirus/tratamento farmacológico , Infecções por HIV/tratamento farmacológico , Influenza Humana/tratamento farmacológico , Pneumonia Viral/tratamento farmacológico , ortoaminobenzoatos/farmacologia , Células A549 , Animais , Betacoronavirus/efeitos dos fármacos , Sítios de Ligação/genética , Linhagem Celular Tumoral , Chlorocebus aethiops , Infecções por Coronavirus/patologia , Cães , Células HEK293 , Infecções por HIV/patologia , HIV-1/efeitos dos fármacos , Interações Hospedeiro-Patógeno/efeitos dos fármacos , Humanos , Vírus da Influenza A/efeitos dos fármacos , Influenza Humana/patologia , Células Madin Darby de Rim Canino , Camundongos , Camundongos Endogâmicos BALB C , Camundongos Endogâmicos C57BL , Camundongos Knockout , Coronavírus da Síndrome Respiratória do Oriente Médio/efeitos dos fármacos , Pandemias , Pneumonia Viral/patologia , Ligação Proteica/genética , Transporte Proteico/efeitos dos fármacos , RNA Viral/genética , Receptor de Interferon alfa e beta/genética , Fator de Crescimento Transformador beta1/metabolismo , Células Vero , Replicação Viral/efeitos dos fármacos , Zika virus/efeitos dos fármacos , Infecção por Zika virus/patologia
9.
Rev Lat Am Enfermagem ; 28: e3310, 2020.
Artigo em Português, Espanhol, Inglês | MEDLINE | ID: mdl-32876288

RESUMO

OBJECTIVE: to understand the influence of the religious beliefs on the decision of a group of women residing in the Huila Department to continue their pregnancies despite perinatal infection by the Zika virus. METHOD: a focused ethnography. The participants were 21 women who had presented a perinatal infection by the Zika virus and whose babies were born with congenital microcephaly. 2 discussion groups and 6 semi-structured interviews were conducted, and thematic analysis was used for data treatment. RESULTS: three themes emerged, namely: "God, why me?" is the initial questioning of the women to God for the prenatal diagnosis of microcephaly in their babies, "Clinging to a divine miracle" describes how the women did not lose their faith and begged for a divine miracle for their babies to be born healthy, and "It was God's will" means acceptance, resignation, and respect for God's will, as well as the denial to abort despite the medical recommendations. CONCLUSION: religiosity and religious beliefs were determinant factors in the women's decision to continue their pregnancies. It becomes necessary to continue investigating this theme to understand their experiences and to generate follow-up and support actions from nursing care.


Assuntos
Infecções , Infecção por Zika virus , Zika virus , Feminino , Nível de Saúde , Humanos , Lactente , Gravidez , Diagnóstico Pré-Natal , Religião
11.
12.
PLoS Negl Trop Dis ; 14(9): e0008527, 2020 09.
Artigo em Inglês | MEDLINE | ID: mdl-32898136

RESUMO

BACKGROUND: Zika virus (ZIKV) emerged in the Pacific Ocean and subsequently caused a dramatic Pan-American epidemic after its first appearance in the Northeast region of Brazil in 2015. The virus is transmitted by Aedes mosquitoes. We evaluated the role of temperature and infectious doses of ZIKV in vector competence of Brazilian populations of Ae. aegypti and Ae. albopictus. METHODOLOGY/PRINCIPAL FINDINGS: Two Ae. aegypti (Rio de Janeiro and Natal) and two Ae. albopictus (Rio de Janeiro and Manaus) populations were orally challenged with five viral doses (102 to 106 PFU / ml) of a ZIKV strain (Asian genotype) isolated in Northeastern Brazil, and incubated for 14 and 21 days in temperatures mimicking the spring-summer (28°C) and winter-autumn (22°C) mean values in Brazil. Detection of viral particles in the body, head and saliva samples was done by plaque assays in cell culture for determining the infection, dissemination and transmission rates, respectively. Compared with 28°C, at 22°C, transmission rates were significantly lower for both Ae. aegypti populations, and Ae. albopictus were not able to transmit the virus. Ae. albopictus showed low transmission rates even when challenged with the highest viral dose, while both Ae. aegypti populations presented higher of infection, dissemination and transmission rates than Ae. albopictus. Ae. aegypti showed higher transmission efficiency when taking virus doses of 105 and 106 PFU/mL following incubation at 28°C; both Ae. aegypti and Ae. albopictus were unable to transmit ZIKV with virus doses of 102 and 103 PFU/mL, regardless the incubation temperature. CONCLUSIONS/SIGNIFICANCE: The ingested viral dose and incubation temperature were significant predictors of the proportion of mosquito's biting becoming infectious. Ae. aegypti and Ae. albopictus have the ability to transmit ZIKV when incubated at 28°C. However Brazilian populations of Ae. aegypti exhibit a much higher transmission potential for ZIKV than Ae. albopictus regardless the combination of infection dose and incubation temperature.


Assuntos
Aedes/virologia , Saliva/virologia , Infecção por Zika virus/transmissão , Animais , Brasil , Mordeduras e Picadas de Insetos/virologia , Mosquitos Vetores/virologia , Estações do Ano , Temperatura , Distribuição Tecidual , Carga Viral , Zika virus
13.
BMC Public Health ; 20(1): 1385, 2020 Sep 11.
Artigo em Inglês | MEDLINE | ID: mdl-32912177

RESUMO

BACKGROUND: In El Salvador, Aedes aegypti mosquitoes transmitting Zika and other arboviruses use water storage containers as important oviposition sites. Promotion of water storage container cleaning is a key element of prevention programs. We explored community perceptions surrounding cleaning practices among pregnant women, male partners of pregnant women, and women likely to become pregnant. METHODS: Researchers conducted 11 focus groups and 12 in-depth interviews which included individual elicitations of Zika prevention measures practiced in the community. Focus group participants rated 18 images depicting Zika-related behaviors according to effectiveness and feasibility in the community context, discussed influencing determinants, voted on community intentions to perform prevention behaviors, and performed washbasin cleaning simulations. In-depth interviews with male partners of pregnant women used projective techniques with images to explore their perceptions on a subset of Zika prevention behaviors. RESULTS: General cleaning of the home, to ensure a healthy environment, was a strong community norm. In this context, participants gave water storage container cleaning a high rating, for both its effectiveness and feasibility. Participants were convinced that they cleaned their water storage containers effectively against Zika, but their actual skills were inadequate to destroy Aedes aegypti eggs. A further constraint was the schedule of water availability. Even during pregnancy, male partners rarely cleaned water storage containers because water became available in homes when they were at work. Furthermore, prevailing gender norms did not foster male participation in domestic cleaning activities. Despite these factors, many men were willing to provide substantial support with cleaning when their partners were pregnant, in order to protect their family. CONCLUSIONS: Behavior change programs for the prevention of Zika and other arboviruses need to improve community members' mosquito egg destruction skills rather than perpetuate the promotion of non-specific cleaning in and around the home as effective. Egg elimination must be clearly identified as the objective of water storage container maintenance and programs should highlight the effective techniques to achieve this goal. In addition, programs must build the skills of family members who support pregnant women to maintain the frequency of effective egg destruction in all water storage containers of the home.


Assuntos
Aedes/virologia , Conhecimentos, Atitudes e Prática em Saúde , Controle de Mosquitos/métodos , Abastecimento de Água , Água , Infecção por Zika virus/prevenção & controle , Zika virus , Adolescente , Adulto , Animais , El Salvador , Feminino , Grupos Focais , Humanos , Masculino , Pessoa de Meia-Idade , Gravidez , Pesquisa Qualitativa , Características de Residência , Adulto Jovem , Zika virus/crescimento & desenvolvimento , Infecção por Zika virus/transmissão , Infecção por Zika virus/virologia
14.
Rev Soc Bras Med Trop ; 53: e20200027, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32997047

RESUMO

INTRODUCTION: In this study, we aim to compare spatial statistic models to estimate the spatial distribution of Zika and Chikungunya infections in the city of Recife, Brazil. We also aim to establish the relationship between the diseases and the analyzed geographical conditions. METHODS: The models were defined by combining three categories: type of spatial unit, calculation of the dependent variable format, and estimation methods (Geographical Weighted Regression [GWR] and Ordinary Least Square [OLS]). We identified the most accurate model to estimate the spatial distribution of the diseases. After selecting the model that provided best results, the relationship between the geographical conditions and the incidence of the diseases was analyzed. RESULTS: It was observed that the matrix of 100 meters (as the spatial unit) showed the highest efficiency to estimate the diseases. The best results were observed in the models that utilized the kernel density estimation (as the calculation of the dependent variable). In all models, the GWR method showed the best results. By considering the OLS coefficient values, it was observed that all geographical conditions are related to the incidence of Zika and Chikungunya, while the GWR coefficient values showed where this relationship was more noticeable. CONCLUSIONS: The model that utilized the combination of the matrix of 100 meters, kernel density estimation (as the calculation of the dependent variable) and GWR method showed the highest efficiency in estimating the spatial distribution of the diseases. The coefficient values showed that all analyzed geographical conditions are related to the illnesses' incidence.


Assuntos
Febre de Chikungunya , Infecção por Zika virus , Zika virus , Brasil , Humanos , Análise de Regressão , Análise Espacial
15.
PLoS Negl Trop Dis ; 14(9): e0008532, 2020 09.
Artigo em Inglês | MEDLINE | ID: mdl-32956416

RESUMO

BACKGROUND: After Zika virus (ZIKV) emerged in the Americas, laboratory-based surveillance for arboviral diseases in Puerto Rico was adapted to include ZIKV disease. METHODS AND FINDINGS: Suspected cases of arboviral disease reported to Puerto Rico Department of Health were tested for evidence of infection with Zika, dengue, and chikungunya viruses by RT-PCR and IgM ELISA. To describe spatiotemporal trends among confirmed ZIKV disease cases, we analyzed the relationship between municipality-level socio-demographic, climatic, and spatial factors, and both time to detection of the first ZIKV disease case and the midpoint of the outbreak. During November 2015-December 2016, a total of 71,618 suspected arboviral disease cases were reported, of which 39,717 (55.5%; 1.1 cases per 100 residents) tested positive for ZIKV infection. The epidemic peaked in August 2016, when 71.5% of arboviral disease cases reported weekly tested positive for ZIKV infection. Incidence of ZIKV disease was highest among 20-29-year-olds (1.6 cases per 100 residents), and most (62.3%) cases were female. The most frequently reported symptoms were rash (83.0%), headache (64.6%), and myalgia (63.3%). Few patients were hospitalized (1.2%), and 13 (<0.1%) died. Early detection of ZIKV disease cases was associated with increased population size (log hazard ratio [HR]: -0.22 [95% confidence interval -0.29, -0.14]), eastern longitude (log HR: -1.04 [-1.17, -0.91]), and proximity to a city (spline estimated degrees of freedom [edf] = 2.0). Earlier midpoints of the outbreak were associated with northern latitude (log HR: -0.30 [-0.32, -0.29]), eastern longitude (spline edf = 6.5), and higher mean monthly temperature (log HR: -0.04 [-0.05, -0.03]). Higher incidence of ZIKV disease was associated with lower mean precipitation, but not socioeconomic factors. CONCLUSIONS: During the ZIKV epidemic in Puerto Rico, 1% of residents were reported to public health authorities and had laboratory evidence of ZIKV disease. Transmission was first detected in urban areas of eastern Puerto Rico, where transmission also peaked earlier. These trends suggest that ZIKV was first introduced to Puerto Rico in the east before disseminating throughout the island.


Assuntos
Epidemias/estatística & dados numéricos , Análise Espaço-Temporal , Infecção por Zika virus/epidemiologia , Feminino , Humanos , Incidência , Masculino , Porto Rico/epidemiologia , Estudos Retrospectivos , Zika virus/isolamento & purificação , Infecção por Zika virus/diagnóstico
16.
PLoS Negl Trop Dis ; 14(8): e0008424, 2020 08.
Artigo em Inglês | MEDLINE | ID: mdl-32745093

RESUMO

Zika virus (ZIKV) causes congenital Zika syndrome (CZS), which is characterized by fetal demise, microcephaly and other abnormalities. ZIKV in the pregnant woman circulation must cross the placental barrier that includes fetal endothelial cells and trophoblasts, in order to reach the fetus. CZS occurs in ~1-40% of cases of pregnant women infected by ZIKV, suggesting that mothers' infection by ZIKV during pregnancy is not deterministic for CZS phenotype in the fetus. Therefore, other susceptibility factors might be involved, including the host genetic background. We have previously shown that in three pairs of dizygotic twins discordant for CZS, neural progenitor cells (NPCs) from the CZS-affected twins presented differential in vitro ZIKV susceptibility compared with NPCs from the non-affected. Here, we analyzed human-induced-pluripotent-stem-cell-derived (hiPSC-derived) trophoblasts from these twins and compared by RNA-Seq the trophoblasts from CZS-affected and non-affected twins. Following in vitro exposure to a Brazilian ZIKV strain (ZIKVBR), trophoblasts from CZS-affected twins were significantly more susceptible to ZIKVBR infection when compared with trophoblasts from the non-affected. Transcriptome profiling revealed no differences in gene expression levels of ZIKV candidate attachment factors, IFN receptors and IFN in the trophoblasts, either before or after ZIKVBR infection. Most importantly, ZIKVBR infection caused, only in the trophoblasts from CZS-affected twins, the downregulation of genes related to extracellular matrix organization and to leukocyte activation, which are important for trophoblast adhesion and immune response activation. In addition, only trophoblasts from non-affected twins secreted significantly increased amounts of chemokines RANTES/CCL5 and IP10 after infection with ZIKVBR. Overall, our results showed that trophoblasts from non-affected twins have the ability to more efficiently activate genes that are known to play important roles in cell adhesion and in triggering the immune response to ZIKV infection in the placenta, and this may contribute to predict protection from ZIKV dissemination into fetuses' tissues.


Assuntos
Expressão Gênica , Trofoblastos/metabolismo , Gêmeos Dizigóticos , Infecção por Zika virus/congênito , Quimiocinas/metabolismo , Matriz Extracelular , Feminino , Predisposição Genética para Doença , Humanos , Células-Tronco Pluripotentes Induzidas , Lactente , Gravidez , Complicações Infecciosas na Gravidez/genética , Complicações Infecciosas na Gravidez/virologia , Trofoblastos/virologia , Zika virus , Infecção por Zika virus/genética
17.
Nat Commun ; 11(1): 3896, 2020 08 04.
Artigo em Inglês | MEDLINE | ID: mdl-32753727

RESUMO

The outbreak of Zika virus (ZIKV) in 2016 created worldwide health emergency which demand urgent research efforts on understanding the virus biology and developing therapeutic strategies. Here, we present a time-resolved chemical proteomic strategy to track the early-stage entry of ZIKV into host cells. ZIKV was labeled on its surface with a chemical probe, which carries a photocrosslinker to covalently link virus-interacting proteins in living cells on UV exposure at different time points, and a biotin tag for subsequent enrichment and mass spectrometric identification of the receptor or other host proteins critical for virus internalization. We identified Neural Cell Adhesion Molecule (NCAM1) as a potential ZIKV receptor and further validated it through overexpression, knockout, and inhibition of NCAM1 in Vero cells and human glioblastoma cells U-251 MG. Collectively, the strategy can serve as a universal tool to map virus entry pathways and uncover key interacting proteins.


Assuntos
Moléculas de Adesão de Célula Nervosa/metabolismo , Proteômica , Receptores Virais/metabolismo , Internalização do Vírus , Replicação Viral/fisiologia , Zika virus/fisiologia , Animais , Antígeno CD56/genética , Antígeno CD56/metabolismo , Linhagem Celular Tumoral , Chlorocebus aethiops , Técnicas de Inativação de Genes , Glioblastoma , Células HEK293 , Interações Hospedeiro-Patógeno/fisiologia , Humanos , Moléculas de Adesão de Célula Nervosa/genética , Células Vero , Proteínas Virais/metabolismo , Ligação Viral , Infecção por Zika virus/virologia
18.
Science ; 369(6507): 1055-1056, 2020 08 28.
Artigo em Inglês | MEDLINE | ID: mdl-32855325
19.
Science ; 369(6507): 1123-1128, 2020 08 28.
Artigo em Inglês | MEDLINE | ID: mdl-32855339

RESUMO

The Zika pandemic sparked intense interest in whether immune interactions among dengue virus serotypes 1 to 4 (DENV1 to -4) extend to the closely related Zika virus (ZIKV). We investigated prospective pediatric cohorts in Nicaragua that experienced sequential DENV1 to -3 (2004 to 2015), Zika (2016 to 2017), and DENV2 (2018 to 2020) epidemics. Risk of symptomatic DENV2 infection and severe disease was elevated by one prior ZIKV infection, one prior DENV infection, or one prior DENV infection followed by one ZIKV infection, compared with being flavivirus-naïve. By contrast, multiple prior DENV infections reduced dengue risk. Further, although high preexisting anti-DENV antibody titers protected against DENV1, DENV3, and ZIKV disease, intermediate titers induced by previous ZIKV or DENV infection enhanced future risk of DENV2 disease and severity, as well as DENV3 severity. The observation that prior ZIKV infection can modulate dengue disease severity like a DENV serotype poses challenges to development of dengue and Zika vaccines.


Assuntos
Vírus da Dengue/imunologia , Dengue Grave/epidemiologia , Infecção por Zika virus/epidemiologia , Infecção por Zika virus/imunologia , Zika virus/imunologia , Anticorpos Antivirais/sangue , Vacinas contra Dengue/imunologia , Humanos , Imunogenicidade da Vacina , Nicarágua/epidemiologia , Risco , Sorogrupo
20.
Proc Natl Acad Sci U S A ; 117(33): 20190-20197, 2020 08 18.
Artigo em Inglês | MEDLINE | ID: mdl-32747564

RESUMO

Arboviruses maintain high mutation rates due to lack of proofreading ability of their viral polymerases, in some cases facilitating adaptive evolution and emergence. Here we show that, just before its 2013 spread to the Americas, Zika virus (ZIKV) underwent an envelope protein V473M substitution (E-V473M) that increased neurovirulence, maternal-to-fetal transmission, and viremia to facilitate urban transmission. A preepidemic Asian ZIKV strain (FSS13025 isolated in Cambodia in 2010) engineered with the V473M substitution significantly increased neurovirulence in neonatal mice and produced higher viral loads in the placenta and fetal heads in pregnant mice. Conversely, an epidemic ZIKV strain (PRVABC59 isolated in Puerto Rico in 2015) engineered with the inverse M473V substitution reversed the pathogenic phenotypes. Although E-V473M did not affect oral infection of Aedes aegypti mosquitoes, competition experiments in cynomolgus macaques showed that this mutation increased its fitness for viremia generation, suggesting adaptive evolution for human viremia and hence transmission. Mechanistically, the V473M mutation, located at the second transmembrane helix of the E protein, enhances virion morphogenesis. Overall, our study revealed E-V473M as a critical determinant for enhanced ZIKV virulence, intrauterine transmission during pregnancy, and viremia to facilitate urban transmission.


Assuntos
Epidemias , Proteínas do Envelope Viral/genética , Infecção por Zika virus/virologia , Zika virus/genética , Zika virus/patogenicidade , Animais , Feminino , Humanos , Macaca fascicularis , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Mutação , Filogenia , Gravidez , Carga Viral , Virulência , Zika virus/fisiologia , Infecção por Zika virus/epidemiologia
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA