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  • 1
    In: Frontiers in Drug Discovery, Frontiers Media SA, Vol. 3 ( 2023-6-1)
    Abstract: In the 21st Century, emergence and re-emergence of infectious diseases is significant and has an increasing importance in global concern of public health. Based on the COVID-19 pandemic and recently reported epidemics, most human pathogens originate in zoonosis. Many of such pathogens are related to viruses that have RNA genomes, which can be presented structurally as a single-strand or double-strand. During the last two decades, a timeline of major RNA viruses emergencies can be exemplified, such as Severe Acute Respiratory Syndrome Coronavirus (SARS-CoV) in 2003, influenza A virus (H1N1) pdm09 in 2009, Middle East respiratory syndrome coronavirus (MERS-CoV) in 2012, Ebola virus (EBOV) in 2013–2016, Zika virus (ZIKV) in 2015 and the SARS-CoV-2 pdm19 in 2019. Even so, prophylactic or therapeutic drugs are unavailable for many RNA viruses circulating. Nonetheless, the COVID-19 pandemic brought considerable scientific advances in accelerating progress regarding prophylaxis, antiviral and drug development, and novel treatments. Regarding RNA virus diseases for humans, arboviruses play an essential and neglected role, constantly reemerging and affecting almost half of the human population, for which no drug has been licensed. Here we review the consolidated RNA viruses’ emergence and re-emergence in the 21st Century through available data. Then, we explored valuable lessons gained during the SARS-CoV-2 pandemic and focused on potential epidemiologic updates, prophylaxis, available treatments, and viral drug inhibitors. Finally, we explore arbovirus’s significance and the ongoing development of effective vaccines, antiviral drugs, and novel therapeutic approaches as strategies to control these neglected tropical diseases (NTD).
    Type of Medium: Online Resource
    ISSN: 2674-0338
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2023
    detail.hit.zdb_id: 3123815-4
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  • 2
    In: Frontiers in Medicine, Frontiers Media SA, Vol. 8 ( 2021-3-2)
    Abstract: Novel severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is the etiologic agent of the ongoing coronavirus disease 2019 (COVID-19) pandemic, which has reached 28 million cases worldwide in 1 year. The serological detection of antibodies against the virus will play a pivotal role in complementing molecular tests to improve diagnostic accuracy, contact tracing, vaccine efficacy testing, and seroprevalence surveillance. Here, we aimed first to evaluate a lateral flow assay's ability to identify specific IgM and IgG antibodies against SARS-CoV-2 and second, to report the seroprevalence estimates of these antibodies among health care workers and healthy volunteer blood donors in Panama. We recruited study participants between April 30th and July 7th, 2020. For the test validation and performance evaluation, we analyzed serum samples from participants with clinical symptoms and confirmed positive RT-PCR for SARS-CoV-2, and a set of pre-pandemic serum samples. We used two by two table analysis to determine the test positive and negative percentage agreement as well as the Kappa agreement value with a 95% confidence interval. Then, we used the lateral flow assay to determine seroprevalence among serum samples from COVID-19 patients, potentially exposed health care workers, and healthy volunteer donors. Our results show this assay reached a positive percent agreement of 97.2% (95% CI 84.2–100.0%) for detecting both IgM and IgG. The assay showed a Kappa of 0.898 (95%CI 0.811–0.985) and 0.918 (95% CI 0.839–0.997) for IgM and IgG, respectively. The evaluation of serum samples from hospitalized COVID-19 patients indicates a correlation between test sensitivity and the number of days since symptom onset; the highest positive percent agreement [87% (95% CI 67.0–96.3%)] was observed at ≥15 days post-symptom onset (PSO). We found an overall antibody seroprevalence of 11.6% (95% CI 8.5–15.8%) among both health care workers and healthy blood donors. Our findings suggest this lateral flow assay could contribute significantly to implementing seroprevalence testing in locations with active community transmission of SARS-CoV-2.
    Type of Medium: Online Resource
    ISSN: 2296-858X
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2021
    detail.hit.zdb_id: 2775999-4
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  • 3
    Online Resource
    Online Resource
    Frontiers Media SA ; 2021
    In:  Frontiers in Sustainable Food Systems Vol. 5 ( 2021-7-28)
    In: Frontiers in Sustainable Food Systems, Frontiers Media SA, Vol. 5 ( 2021-7-28)
    Abstract: Increasing atmospheric [CO 2 ] is thought to contribute to changes in precipitation patterns, increasing heatwaves and severe drought scenarios. However, how the combination of elevated [CO 2 ] and progressive drought affect plant metabolism is poorly understood. Aiming to investigate the effects of this environmental condition on photosynthesis and specialized metabolites in leaves of Coffea arabica during the early growth, plants fertilized with ambient (a[CO 2 ]-400 ppm) and elevated (e[CO 2 ]-800 ppm) [CO 2 ] were exposed to well-watered (WW) or water-deficit (WD) regimes for 40 days. Over the 40-day-water-withdrawal, soil moisture, and leaf water potential decreased compared to WW-condition. Elevated [CO 2 ] stimulates CO 2 assimilation (A) and intrinsic water use efficiency (iWUE) even under WD. Drought condition slightly changed stomatal conductance, transpiration rate and maximum quantum efficiency of photosystem II (PSII) regardless of [CO 2 ] compared to WW-plants. Total soluble amino acid concentration did not change significantly, while total phenolic compounds concentration decreased under e[CO 2 ] regardless of water regimes. The combination of e[CO 2 ]+WD increased the 5-O-caffeoylquinic acid (5-CQA) and caffeine amounts by 40-day when compared to a[CO 2 ]+WD plants. Altogether, these results suggest that e[CO 2 ] buffers mild-drought stress in young C. arabica by increasing A, iWUE and stimulating changes in the leaf contents of 5-CQA and caffeine.
    Type of Medium: Online Resource
    ISSN: 2571-581X
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2021
    detail.hit.zdb_id: 2928540-9
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  • 4
    In: Frontiers in Tropical Diseases, Frontiers Media SA, Vol. 2 ( 2021-11-10)
    Abstract: The emergence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has caused a major international public health concern. The World Health Organization (WHO) declared the pandemic of coronavirus disease 2019 (COVID-19) on March 11, 2020. In Panama, the first SARS-CoV-2 infection was confirmed on March 9, 2020, and the first fatal case associated to COVID-19 was reported on March 10. This report presents the case of a 44-year-old female who arrived at the hospital with a respiratory failure, five days after the first fatal COVID-19 case, and who was living in a region where hantavirus pulmonary syndrome cases caused by Choclo orthohantavirus (CHOV), are prevalent. Thus, the clinical personnel set a differential diagnosis to determine a respiratory disease caused by the endemic CHOV or the new pandemic SARS-CoV-2. This case investigation describes the first coinfection by SARS-CoV-2 and CHOV worldwide. PCR detected both viruses during early stages of the disease and the genomic sequences were obtained. The presence of antibodies was determined during the patient’s hospitalization. After 23 days at the intensive care unit, the patient survived with no sequelae, and antibodies against CHOV and SARS-CoV-2 were still detectable 12 months after the disease. The detection of the coinfection in this patient highlights the importance, during a pandemic, of complementing the testing and diagnosis of the emergent agent, SARS-CoV-2, with other common endemic respiratory pathogens and other zoonotic pathogens, like CHOV, in regions where they are of public health concern.
    Type of Medium: Online Resource
    ISSN: 2673-7515
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2021
    detail.hit.zdb_id: 3097199-8
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