In silico discovery of diagnostic/vaccine candidate antigenic epitopes and a multi-epitope peptide vaccine (NaeVac) design for the brain-eating amoeba Naegleria fowleri causing human meningitis

Naegleria fowleri, the brain-eating amoeba, is a free-living amoeboflagellate with three different life cycles (trophozoite, flagellated, and cyst) that lives in a variety of habitats around the world including warm freshwater and soil. It causes a disease called naegleriasis leading meningitis and primary amoebic meningoencephalitis (PAM) in humans. N. fowleri is transmitted through contaminated water sources such as insufficiently chlorinated swimming pool water or contaminated tap water, and swimmers are at risk. N. fowleri is found all over the world, and most infections were reported in both developed and developing countries with high mortality rates and serious clinical findings. Until now, there is no FDA approved vaccine and early diagnosis is urgent against this pathogen. In this study, by analyzing the N. fowleri vaccine candidate proteins (Mp2CL5, Nfa1, Nf314, proNP-A and proNP-B), it was aimed to discover diagnostic/vaccine candidate epitopes and to design a multi-epitope peptide vaccine against this pathogen. After the in silico evaluation, three prominent diagnostic/vaccine candidate epitopes (EAKDSK, LLPHIRILVY, and FYAKLLPHIRILVYS) with the highest antigenicities were discovered and a potentially highly immunogenic/antigenic multi-epitope peptide vaccine (NaeVac) was designed against the brain-eating amoeba N. fowleri causing human meningitis.

The impact of the COVID-19 pandemic on the circulation, seasonal distribution, and research of other respiratory pathogens in Turkey

INTRODUCTION

Respiratory infections are one of the world's most common infectious diseases. Following the species, numbers, and seasonal distribution of acute respiratory agents is important for the protection of public health. Our study aimed to determine the effect of the COVID-19 pandemic on the circulation and seasonal distribution of non-SARS-CoV-2 respiratory tract agents and research on non-SARS-CoV-2 agents.

METHODS

The results of the Multiplex PCR respiratory panel of 3702 nasopharyngeal swab samples sent between January 2018 and December 2021 were evaluated retrospectively. Scientific articles on acute respiratory infections between 2010 and 2021 from Turkey were analyzed in Scopus for bibliometric analysis.

RESULTS

1.382 pathogens were detected. During the pandemic, the number of non-SARS-CoV-2 pathogens was found to be statistically significantly lower than before the pandemic. It was determined that while the most frequent agent before the pandemic was the Adenovirus, the most frequent agent was the RSV-A during the pandemic. Our network analysis of keywords indicated that academic interest in 2020-21 was directed toward COVID-19, which coincides with the pandemic period.

CONCLUSIONS

Our study determined the fact that the incidence, species, and seasonal distribution of non-SARS-COV-2 respiratory agents changed after the onset of the pandemic. Increasing the identification and following-up of these pathogens in health organizations and also presenting these data to literature and sharing with academics is important. We are of the opinion that the results of our study shall shed light on the epidemiology of changing respiratory infections and the prevention and following-up of future health problems.

A Scopus-Based Bibliometric Analysis of Global Tuberculosis Publications: 1849-2020

OBJECTIVE: Tuberculosis continues to become a serious public-health concern in many countries despite efforts to prevent and control global tuberculosis infections.

MATERIAL AND METHODS: This study aims to present bibliometric analysis of the period 1849-2020 tuberculosis publications that are published by global researchers and indexed in the Scopus database. Although many studies have been carried out on tuberculosis, there is no study that performs bibliometric analysis of publications in this field in such a wide range of dates. Tuberculosis publications searched in the Scopus database between the period 1849-2020 were analyzed. Data on tuberculosis were presented by analyzing the number of publications, the language of publication, the countries that contribute the most to the literature, the most active institutions, the most cited publications, active authors and active journals, using appropriate quantitative and qualitative bibliometric indicators.

RESULTS: 263,234 articles, published between 1849 and 2020 and searched in the Scopus database, were evaluated. The most articles (n= 8.344) were published in 2020. A total of 112,121 articles were published between 2001 and 2020. The most used publication language in the articles was English (62.48%), followed by Russian (7.25%). The country that contributed the most to the literature was the United States (13.81%), followed by India (7.18%). 3.9% of the articles were published in the journal “Tuberculosis and Lung Diseases”.

CONCLUSION: The results of the present bibliometric study are expected to shed light on the planning of future tuberculosis studies and the development of health policies toward tuberculosis. Research output is low in some countries, which should make larger investments in international and national collaborative research projects in the field of tuberculosis. If doing so, many countries of limited source will benefit from research that offer novel diagnostic and screening technology of tuberculosis.