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North Atlantic Oscillation and Rainfall Variability in southeastern nigeria:A Statistical Analysis of 30 Year Period

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Journal of Atmospheric Science Research 2021年第4期4卷 42-49页

作者： Okorie Fidelis Chinazor Department of Geography and Environmental Management Imo State University OwerriNigeria

This study analyzed rainfall variability in Southeast region of nigeria using graphical models,as well as using statistical approach to investigate any significant relationship between the global North Atlantic Oscillation(NAO)Index and the regional rainfall variability in *** study was conducted in three States of southeastern nigeria namely,Abia,Ebonyi and Imo States that lie between Latitudes 4040’and 8050’N and Longitudes 6020’and 8050’*** for the study included 30 years(1988-2017)archival time-series monthly rainfall values for the three study States,acquired from nigerian Meteorological Agency(NIMET),offices in the states,and Standardized values of NAOI(North Atlantic Oscillation Index)for the same period,which were collected from a website,on the NOAA Data Center,*** the data analyses,the first method was adopted by using graphs to illustrate mean annual rainfall values for thirty *** of variability was employed in evaluating the degree of variability of values from the mean *** second analysis was accomplished using correlation models to ascertain any relationship between NAOI and rainfall in Southeast *** results showed a significant variability of rainfall in the region from January to December(mean monthly)within the study period.A negative correlation value of 0.7525 was obtained from the correlation analysis,showing that the global NAO index and rainfall variability deviate in the opposite *** of multiple determinations(CMD)subsequently showed value of 0.031%,being the variation in rainfall as influenced by the global teleconnectivity,and this means that the NAO index has zero or no influence on rainfall variability in Southeast region of nigeria.

关键词： NAO Rainfall variability Relationship Statistical analysis southeastern nigeria

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Comparison of Four Diagnostic Tests Methods for the Detection of Dengue Virus Non-Structural-1 Antigen and IgM/IgG Antibodies

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Journal of Biosciences and Medicines 2022年第5期10卷 179-190页

作者： Moses N. Ikegbunam Ifeyinwa T.O. Onochie-Igbinedion Nzube F. Ekpunobi Abone Harrison Enyi Emmanuel Simon Nkpeh Ushie Micheal U. Adiukwu Charles O. Esimone Department of Pharmaceutical Microbiology and Biotechnology Nnamdi Azikiwe University Awka Nigeria Molecular Research Foundation for Students and Scientists Nnamdi Azikiwe University Awka Nigeria Department of Medical Microbiology Nnamdi Azikiwe University Awka Nigeria Department of Pharmaceutics University of Nigeria Nsukka (UNN) Nsukka Nigeria

Objectives: Dengue virus (DENV) infection is a mosquito-borne disease that stands out as one of the major public health issues and has a wide-ranging geographical distribution throughout the tropics and subtropics. The general alarming increase in the number of cases over the last two decades can be attributed to an extent by the change in national practices to keeping records and reporting dengue to the Ministries of Health, and WHO. Dengue diagnosis is routinely carried out by detection of dengue virus (DENV) antigen NS1 (Non-structural Antigen 1) and/or anti-DENV IgM/IgG antibodies using enzyme-linked immunosorbent assays (ELISAs) and rapid diagnostic tests (RDTs). This study compared the performance of three RDTs and one ELISA used for dengue diagnosis in southeastern, nigeria. Design: This study adopted a cross-sectional design that included prospective hospital-based surveillance of cases among febrile participants attending two major health facilities within the southeastern region of nigeria. In this study, 338 HIV-infected participants from two teaching hospitals in nigeria’s southeast were systematically tested for Dengue with four methods: NS1 RDT, IgG RDT, IgM RDT, and NS1 ELISA. Their specificities and sensitivities were compared, as well as their level of concordance. Their respective performances were also evaluated using the Receivers Operational curve (ROC). Results: Out of the 338 patients, the dengue prevalence from the four dengue diagnostic methods Dengue virus NS1 ELISA, NS1 RDT, IgM and IgG seropositivity were 8.9%, 0.6%, 5.6%, and 8.0%, respectively. The Dengue IgM RDT test indicated 36.8% sensitivity, 92.8% specificity, the IgG anti-dengue specific test indicated 29.6% sensitivity, 92.9% specificity and the dengue NS1 RDT test indicated 3.3% sensitivity, 99.4% specificity when compared with the Dengue NSI Elisa test method as a reference method. Conclusion: The use of NSI ELISA for DENV diagnosis showed good performance and the RDTs showed,

关键词： Dengue Virus Diagnosis Methods Comparison Performance southeastern nigeria

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