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.

30th March 2022 • 0 comments

*Portuguese content* Com objetivo de avaliar como as famílias dessas crianças foram impactadas, a pesquisa Impactos econômicos e sociais do vírus Zika foi realizada no IFF-Fiocruz, hospital público federal situado no Rio de Janeiro, que atua em ensino, pesquisa e atendimento a mulheres, crianças e adolescentes.

30th March 2021 • 0 comments
23rd November 2020 • 0 comments

Abstract We investigated an outbreak of exanthematous illness in Maceió by using molecular surveillance; 76% of samples tested positive for chikungunya virus. Genetic analysis of 23 newly generated genomes identified the East/Central/South African genotype, suggesting that this lineage has persisted since mid-2014 in Brazil and may spread in the Americas and beyond.

10th October 2017 • 2 comments
18th August 2017 • comment

Institut Pasteur Shanghai-Chinese Academy of Sciences (IPS-CAS), a partner of the ZIKAlliance consortium, announced that it has entered into a collaborative research agreement with Chongqing Zhifei Biological Products Stock Co., Ltd. (Zhifei) for the clinical studies and commercialization of a recombinant Zika virus subunit vaccine developed by IPS-CAS.

5th April 2017 • comment

The key message from this study is that the large uncertainty around the risk estimate needs to be further investigated because of a) the possible existence of co-factors that are yet to be validated, b) the assumptions that the authors needed to make in the absence of good data for the proportion of women who were infected during pregnancy.

10th March 2017 • comment
3rd March 2017 • comment

This pioneering study provides a precise follow-up of incident cases and seroprevalence in blood donors, and it also provides important insights into the management of blood donations during ZIKV outbreaks and into the natural history of ZIKV infection in adults. It suggests that the study of blood donors during outbreaks of emerging pathogens has become a key element of epidemiological surveillance.

23rd January 2017 • comment

A study performed by the Institut National de la Santé et de la Recherche Médicale (INSERM) team of Dr Ali Amara (U944, Paris, France) and published in Cell Reports sheds new light on the mechanisms allowing ZIKV to infect cells within the human nervous system. Amara et al. showed that the protein Axl is expressed in a number of brain glial cells and that the entry of ZIKV into these cells requires another protein, Gas6, to act as a bridge between the ZIKV particles and the glial cells.

18th January 2017 • comment

Global research platforms receive €30M to combat Zika   Oxford --21 October 2016, ISARIC members are part of two successful bids to the European Union’s Horizon 2020 Research and Innovation Programme that will set up multinational and multi-disciplinary research consortia to combat Zika virus (ZIKV) infection and build pandemic preparedness in Latin America and the Caribbean over the next 3 to 5 years, the European Commission announced today.

21st October 2016 • comment

Today,The Global Health Network launches Mesh: a new online platform co-created by its users and aiming to improve Community Engagement with health in low and middle income countries.

20th September 2016 • comment

Laboratory systems and diagnostic technologies are a critical pillar in the fight against malaria. The World Health Organization (WHO) recommends diagnostic testing for all people with suspected malaria before treatment is administered.

25th April 2016 • 0 comments

Understanding the Zika virus

by Center for Strategic & International Studies

U.S. efforts to combat the Zika virus in the US and abroad

22nd March 2016 • 0 comments

Travel Medicine and Infectious Diseases have evolved rapidly in recent decades as outbreaks such as SARS, Avian Influenza, Ebola, MERS, Chikungunya, and Zika virus have demonstrated how quickly infections can cross international borders.

18th March 2016 • 0 comments

The Zika virus appears to have emerged from nowhere, causing widespread health concerns throughout the world after decades of relative silence.

9th March 2016 • 0 comments

This Week in Global Health or TWiGH presents Global Health Out Loud with Sulzhan Bali & Jessica Taaffe.

9th March 2016 • 0 comments