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Assessment of Domestic Water Sources Safety: Application of the Micro Biological Survey Method and Microbiological Profile of the Contaminating Bacteria

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Journal of Water Resource and Protection 2021年第5期13卷 350-361页

作者： Sali Ben Béchir Adogaye Mabvouna Biguioh Rodrigue Nkamedjie Pete Patrick Martial Andrillene Laure Deutou Wondeu Sanou Sobze Martin Jean Blaise Kemogne carla montesano Colizzi Vittorio Department of Biology Faculty of Sciences University of Rome “Tor Vergata” Rome Italy Evangelical University of Cameroon Mbouo-Bandjoun Cameroon Faculty of Medicine and Pharmaceutical Sciences University of Dschang Dschang Cameroon

Water is essential for human life and it’s expected to be clean and safe. In Cameroon, government efforts to improve access to drinking water are mitigated. Many households are suffering from chronic water shortages leading to the majority of people using doubtful water sources. This study was carried out in accordance with guidelines produced by the STARBIOS2-EU funded project on Responsible Research and Innovation and aimed to assess the microbiological quality of water samples collected from domestic water sources in 3 divisions of the West region of Cameroon. 22 water samples from well water, stream, water pump and river were aseptically collected. At each sampling point, 50 mL of sample was taken aseptically and immediately transported to the laboratory for analysis. The detection of Coliforms bacteria was done using Micro Biological Survey (MBS) method. 1 mL of each sample was inoculated in the Coliforms MBS (Coli MBS) vial initially rehydrated with 10 mL of sterile distilled water. The Coli MBS vials were closed, shaken for homogenization, and then incubated at 37°C. From the initial red color of the Coli MBS vials, changes in color to yellow of the reaction vials were monitored at three different time intervals (12 h, 19 h and 24 h), corresponding to three levels of bacterial concentration. All positives samples on MBS method were selected to determine the presence of E. coli Loop full broths of Coli MBS vials were taken;streaked into the eosin methylene blue (EMB) agar plate and incubated at 37°C for 24 hours. E. coli was confirmed by observing green metallic sheen on EMB agar plate. The biochemical indole, methyl red, Voges-Proskauer and citrate (IMViC) test was performed to determine the complete microbiological profile of the water samples. Almost all the water samples were contaminated with Total Coliforms (TC). A high concentration of TC (>103 CFU/mL) was found in 8 samples (36.4

关键词： Water Assessment Micro Biological Survey Method Biochemical IMViC Test West Cameroon

Viral Hepatitis B and C Detection among Ebola Survivors and Health Care Workers in Makeni, Sierra Leone

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Journal of Biosciences and Medicines 2020年第10期8卷 18-32页

作者： Nadege Goumkwa Mafopa Marta Giovanetti Raoul Emeric Guetiya Wadoum Antonella Minutolo Claude Kwe Yinda Gianluca Russo Béatrice Dambaya Georges Teto Georgia Ambada Patrick Turay Judith Torimiro Alexis Ndjolo Vittorio Colizzi carla montesano Chantal BIYA International Reference Centre for Research on HIV/AIDS Prevention and Management Yaoundé Cameroon University of Roma “Tor Vergata” Rome Italy National Institute of Health-ISS Rome Italy University of Makeni Sierra Leone National Institute of Health (NIH) Intramural Research Program (IRP) Hamilton Montana USA University di Roma “Sapienza” Rome Italy Chantal BIYA International Reference Centre for Research on HIV/AIDS Prevention and Management University of Yaoundé I Yaoundé Cameroon Holy Spirit Hospital Makeni Sierra Leone Faculty of Medicine and Biomedical Sciences University of Yaoundé I Yaoundé Cameroon

Viral hepatitis B and C infections are among the leading cause of death in Sub-Saharan Africa. Lack of knowledge and awareness in the general population as in health care settings may enhance the propagation of these diseases. We aimed at determining the prevalence of HBV and HCV in Ebola survivors and health care workers (HCWs) of the Makeni town in Sierra Leone. We conducted a cross-sectional study during the last 2013-2016 Ebola outbreak in Makeni among Ebola survivors (N = 68) and 81 Health care workers from Holy Spirit hospital and Loreto clinic, two health care facilities in Makeni district. Serological markers of HBV (HBs Ag, anti-HBs Ab and anti-HBc Ab) and anti-HCV antibodies detection were done using ELISA techniques. The positive detection rates for HBs Ag, anti-HBs Ab and anti-HBc antibodies in Ebola survivors were 23.53% (16/68), 32.35% (22/68) and 88.89% (16/18) respectively. Survivors with a current HBV infection had a positive rate of 38.89% (7/18) and 16.66% (3/18) of them were considered immune due to past HBV infection. HCV prevalence was 26.47% (18/68) and about 10.29% (7/68) were HBV/HCV co-infected. The positive detection rates of HBsAg, anti-HBs Ab and anti-HBc Ab were 37.07% (30/81), 33.33% (27/81) and 30.86% (25/81) respectively in health care workers. We observed that 4.94% (4/81) of the HCWs were currently infected with HBV. Participants considered as immune due to past infection represented 23.47% (19/81) and those immune due to vaccination represented 2.47% (2/81). The prevalence of HCV infection among health staff was 2.47% (2/81) with 1.23% (1/81) being HBV/HCV co-infection. Our findings showed that viral hepatitis infection is a burden for Sierra Leone government. There is an urgent need to develop and implement strategies that could improve population immunization against HBV and vulgarization of HCV treatment programs.

关键词： Viral Hepatitis B and C Ebola Survivors Health Care Workers

Immunoglobulin G Specific Antibody Level against Ebola Viral Glycoprotein and Nucleoprotein in Ebola Virus Disease Survivors and Their Relatives

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Journal of Biosciences and Medicines 2021年第4期9卷 179-196页

作者： Nadège Goumkwa Mafopa Raoul Emeric Guetiya Wadoum Marta Giovanetti Antonella Minutolo Béatrice Dambaya Claude Kwe Yinda Gianluca Russo Georges Teto Georgia Ambada Patrick Turay Judith Torimiro Alexis Ndjolo Jules Roger Kuate Vittorio Colizzi carla montesano Chantal BIYA International Reference Centre for Research on HIV/AIDS Prevention and Management Yaoundé Cameroon University of Roma “Tor Vergata” Rome Italy Department of Biochemistry University of Dschang Dschang Cameroon Departement of Public Health University of Makeni Makeni Sierra Leone National Institute of Health—ISS Rome Italy Faculty of Science University of Yaoundé I Yaoundé Cameroon Intramural Research Program National Institute of Health Bethesda Maryland USA University di Roma “Sapienza” Rome Italy Holy Spirit Hospital Makeni Makeni Sierra Leone Faculty of Medicine and Biomedical Sciences University of Yaoundé I Yaoundé Cameroon

Ebola virus disease is a complex zoonosis that is highly virulent in humans. Despite its sorely pathogenic and lethal nature, survivors of this infection and even asymptomatic cases are able to develop both humoral and cellular immunity against several Ebola virus (EBOV) proteins. We aimed at determining immunoglobulin G (IgG) antibodies level against two Ebola viral antigens, the glycoprotein and the nucleoprotein in Ebola survivors and their relatives. Anti-EBOV glycoprotein (GP) and nucleoprotein (NP) IgG antibodies were quantified using ELISA. We enrolled 199 participants in two different sites as follow: 91 survivors at the Loreto clinic and 70 survivors with 38 relatives of Sierra Leone Association of Ebola Survivors Bombali Branch (SLAESB) tested for anti-EBOV NP and anti-EBOV GP IgG antibodies. Our findings revealed that the median anti-EBOV IgG level among survivors was 5.7128 U/ml [IQR: 2.793 - 7.783] for anti-EBOV GP IgG and 4.431 U/ml [IQR: 2.083 - 7.696] for anti-EBOV NP IgG. Survivors relatives had a median anti-EBOV GP IgG level of ?0.7128 U/ml [IQR: -0.903 to -0.04327] and -2.711 U/ml [IQR: -4.01 to -1.918] for anti-EBOV NP IgG. We observed that IgG levels in survivors were higher than in relatives with a significant difference of about 0.0001. The median value of anti-EBOV IgG level among seropositive relatives was 0.7043 U/ml [IQR: 0.5686 to 3.716] for anti-EBOV GP IgG and 4.05 U/ml [IQR: 0.2765 to 7.759] for anti-EBOV NP IgG respectively. Interestingly, we observed that 3.30% of Loreto clinic survivors did not developed anti-EBOV NP IgG antibodies;also about 10% survivors of the SLAESB were not reactive to anti-EBOV NP IgG and 1.43% of these survivors did not express antibodies against the Ebola viral glycoprotein. Our work is consistent with previous published studies showing heterogeneity in both survivors and asymptomatic cases of Ebola infection developing adaptive immunity against EBOV proteins.

关键词： Immunoglobulin IgG Level Ebola Survivors and Relatives Glycoprotein and Nucleoprotein

Key role of human leukocyte antigen in modulating human immunodeficiency virus progression: An overview of the possible applications

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World Journal of Virology 2015年第2期4卷 124-133页

作者： Alba Grifoni carla montesano Vittorio Colizzi Massimo Amicosante Department of Biology University of Rome "Tor Vergata" Department of Biomedicine and Prevention University of Rome "Tor Vergata"

Host and viral factors deeply influence the human immunodeficiency virus(HIV) disease progression. Among them human leukocyte antigen(HLA) locus plays a key role at different levels. In fact, genes of the HLA locus have shown the peculiar capability to modulate both innate and adaptive immune responses. In particular, HLA class Ⅰmolecules are recognized by CD8+ T-cells and natural killers(NK) cells towards the interaction with T cell receptor(TCR) and Killer Immunoglobulin Receptor(KIR) 3DL1 respectively. Polymorphisms within the different HLA alleles generate structural changes in HLA classⅠpeptide-binding pockets. Amino acid changes in the peptide-binding pocket lead to the presentation of a different set of peptides to T and NK cells. This review summarizes the role of HLA in HIV progression toward acquired immunodeficiency disease syndrome and its receptors. Recently, many studies have been focused on determining the HLA binding-peptides. The novel use of immune-informatics tools, from the prediction of the HLA-bound peptides to the modification of the HLAreceptor complexes, is considered. A better knowledge of HLA peptide presentation and recognition are allowing new strategies for immune response manipulation to be applied against HIV virus.

关键词： Human immunodeficiency virus progression Human leukocyte antigen Epitope Immunoinformatics CD8+T lymphocytes