Field validation of the performance of paper-based tests for the detection of the Zika and chikungunya viruses in serum samples
by Margot Karlikow et al.In low-resource settings, resilience to infectious disease outbreaks can be hindered by limited access to diagnostic tests. Here we report the results of double-blinded studies of the performance of paper-based diagnostic tests for the Zika and chikungunya viruses in a field setting in Latin America. The tests involved a cell-free expression system relying on isothermal amplification and toehold-switch reactions, a purpose-built portable reader and onboard software for computer vision-enabled image analysis. In patients suspected of infection, the accuracies and sensitivities of the tests for the Zika and chikungunya viruses were, respectively, 98.5% (95% confidence interval, 96.2–99.6%, 268 serum samples) and 98.5% (95% confidence interval, 91.7–100%, 65 serum samples) and approximately 2 aM and 5 fM (both concentrations are within clinically relevant ranges). The analytical specificities and sensitivities of the tests for cultured samples of the viruses were equivalent to those of the real-time quantitative PCR. Cell-free synthetic biology tools and companion hardware can provide de-centralized, high-capacity and low-cost diagnostics for use in low-resource settings.
Detection of arboviruses in mosquitoes: Evidence of circulation of chikungunya virus in Iran
by Bakhshi et al.This is the first report of mosquitoes infected with CHIKV in Iran. The high-throughput screening method here presented can be proposed as a novel epidemiological surveillance tool to identify circulating arboviruses and to support preparedness to an epidemic in animals and humans.
A Systematic Review: Is Aedes albopictus an Efficient Bridge Vector for Zoonotic Arboviruses?
by Pereira dos Santos et al.This analysis confirms the potential of Ae. albopictus as a bridge vector based on its colonization of natural breeding sites in newly invaded areas, its opportunistic feeding behaviour together with the preference for human blood, and the competence to transmit 14 arboviruses.
The present study showed that there is no evidence that the ZIKV established an independent sylvatic cycle in the state of Rio de Janeiro, and provided new evidence that there was no urban transmission of Yellow Fever Virus in southeast Brazil during the current outbreak.
Gender mainstreaming as a pathway for sustainable arbovirus control in Latin America
by Wenham et al.Building on the UN’s Sustainable Development Goals commitment to “leave no one behind” and the recent championing of a need for a people-centered approach to epidemic preparedness and response, the authors call for more evidence that can support policy recommendations and advocacy efforts for gender-mainstreamed arbovirus control programs in Latin America.
From ancient to emerging infections: the odyssey of viruses in the male genital tract
by Le Tortorec et al.The authors review here how viruses, from ancient viruses that integrated the germ line during evolution through old viruses (e.g. papillomaviruses originating from Neanderthals) and more modern sexually-transmitted infections (e.g. simian zoonotic HIV) to emerging viruses (e.g. Ebola and Zika) take advantage of genital tract colonization for horizontal dissemination, viral persistence, vertical transmission and endogenization.
Study protocol for the multicentre cohorts of Zika virus infection in pregnant women, infants, and acute clinical cases in Latin America and the Caribbean: the ZIKAlliance consortium
by Avelino-Silva et al.Results of large cohort studies will provide better risk estimates for birth defects and other developmental abnormalities associated with ZIKV infection including possible co-factors for the variability of risk estimates between other countries and regions. Additional outcomes include incidence and transmission estimates of ZIKV during and after pregnancy, characterization of short and long-term clinical course following infection and viral kinetics of ZIKV.
For this study researchers collected nasopharyngeal specimens from 282 children aged ≤5 years with acute respiratory tract infection (ARI) during 2005 to 2006 in one of the largest Brazilian slums.
Management of insecticide resistance in the major Aedes vectors of arboviruses: Advances and challenges
by Dusfour et al.Based on a plan developed for malaria vectors, here the authors propose some key activities to establish a global plan for insecticide resistance management in Aedes species.
A New High-Throughput Tool to Screen Mosquito-Borne Viruses in Zika Virus Endemic/Epidemic Areas
by Moutailler et al.The authors present and show a new tool that can detect endemic and epidemic viruses in different mosquito species in an epidemic context. This fast and low-cost method can be suggested as a novel epidemiological surveillance tool to identify circulating arboviruses.
High specificity and sensitivity of Zika EDIII-based ELISA diagnosis highlighted by a large human reference panel
by Denis et al.Researchers developed a ZEDIII-based ELISA that can discriminate between past or current DENV and ZIKV infections, allowing the detection of a serological scar from other flaviviruses. This could be used to confirm exposure of pregnant women or to follow the spread of an endemic disease.
Sloths host Anhanga virus‐related phleboviruses across large distances in time and space
by de Oliveira Filho et al.In this study, researchers confirmed the association of Anhanga virus (ANHV)‐related viruses with both extant two‐toed sloth species in the Choloepus genus across 3,000 km distance and half a century between the both detections.
This study shows a broad picture of possible interactions between mosquito cellular miRNAs and the viral RNA of different genotypes/lineages of arboviruses, providing a list of mosquito cellular miRNAs candidates for experimental validations in future studies.
Results obtained in this study suggest that the local transmission of four arboviruses - dengue (DENV), chikungunya (CHIKV), zika (ZIKV) and yellow fever (YFV) viruses - by Ae. albopictus newly introduced in Morocco is a likely scenario.
Control of Acute Arboviral Infection by Natural Killer Cells
by Maucourant et al.In this study, researchers review recent developments in the understanding of the immune response, with an emphasis on the early antiviral immune response mediated by natural killer cells and emphasize their Janus-faced effects in the control of arbovirus infection and pathogenesis.
Results from this study indicate a low ZIKV transmission by Ae. aegypti and Ae. polynesiensis tested from the Pacific region. These results were unexpected and suggest the importance of other factors especially the vector density, the mosquito lifespan or the large immunologically naive fraction of the population that may have contributed to the rapid spread of the ZIKV in the Pacific region during the 2013–2017 outbreak.
Characterization of the Zika virus induced small RNA response in Aedes aegypti cells
by Varjak et al.Results from this study suggest that ZIKV has mechanisms to evade mosquito innate immunity and it is therefore important to understand virus-vector interactions and the implications they have on transmission.
Emerging arboviruses: Why today?
by Gould et al.In this study, the authors select examples of (re)emerging pathogenic arboviruses and explain the reasons for their emergence and different patterns of dispersal, focusing particularly on the mosquito vectors which are important determinants of arbovirus emergence. They also attempt to identify arboviruses likely to (re)emerge in the future.