Prevalence and predictors of cigarette smoking and alcohol use among secondary school students in Nigeria

BACKGROUND: Cigarette and alcohol use are the most common causes of noncommunicable diseases. Studies related to cigarette and alcohol use among Nigerian adolescents have shown increases in the habits and require urgent intervention. Nationally representative data is needed to develop effective national policies and interventions, but this is lacking. Hence, this study aimed to provide nationally representative empiric information about cigarette and alcohol use prevalence and predictors among Nigerian secondary school students. METHODS: This study included 2,530 Nigerian students in Nigeria from five of the six geopolitical zones in Nigeria. A self-administered questionnaire was used to obtain information about the participants’ sociodemographic and school-based characteristics, cigarette and alcohol use status, and harm perception of tobacco and alcohol use. Data were analysed with SPSS version 25 at p<0.05. RESULTS: Participants' mean age (±SD) was 16.34 (±2.0) years. The prevalences (95%CI) for ever-cigarette and current-cigarette smoking were 11.1% (95%CI:9.9-12.4) and 8.4% (95%CI:7.3-9.5), respectively. While 21.0% (95%CI:19.4-22.7) and 15.6% (14.2-17.1) were the prevalences for lifetime and current alcohol use, respectively. The predictors of current cigarette smoking were studying in northern-Nigeria (aOR:1.94;95%CI:1.10-3.44), attending private-schools (aOR:1.56;95%CI:1.03-2.38), boarding-student (aOR:1.75;95% CI:1.15-2.69), male-gender (aOR:3.03; 95%CI:1.80-5.10), current alcohol use (aOR:12.50;95%CI:8.70-18.18), having no (aOR:2.59;95%CI:1.58-4.26) or low tobacco harm perception (aOR:2.04;95%CI:1.18-3.53). The predictors of current alcohol use were male (aOR:1.32; 95%CI:1.01-1.72) and current cigarette smoking (aOR:12.5;95%CI:8.77-17.86). CONCLUSION: The prevalences of cigarette and alcohol use were high among Nigerian secondary school students, and both habits were strongly associated. Their predictors were school-related factors, sociocultural characteristics, and tobacco harm perception

Dementia in Africa: Current evidence, knowledge gaps, and future directions

\ua9 2021 the Alzheimer\u27s Association. In tandem with the ever-increasing aging population in low and middle-income countries, the burden of dementia is rising on the African continent. Dementia prevalence varies from 2.3% to 20.0% and incidence rates are 13.3 per 1000 person-years with increasing mortality in parts of rapidly transforming Africa. Differences in nutrition, cardiovascular factors, comorbidities, infections, mortality, and detection likely contribute to lower incidence. Alzheimer\u27s disease, vascular dementia, and human immunodeficiency virus/acquired immunodeficiency syndrome–associated neurocognitive disorders are the most common dementia subtypes. Comprehensive longitudinal studies with robust methodology and regional coverage would provide more reliable information. The apolipoprotein E (APOE) ε4 allele is most studied but has shown differential effects within African ancestry compared to Caucasian. More candidate gene and genome-wide association studies are needed to relate to dementia phenotypes. Validated culture-sensitive cognitive tools not influenced by education and language differences are critically needed for implementation across multidisciplinary groupings such as the proposed African Dementia Consortium

Mucosal immunization with PspA (Pneumococcal surface protein A)-adsorbed nanoparticles targeting the lungs for protection against pneumococcal infection

Burden of pneumonia caused by Streptococcus pneumoniae remains high despite the availability of conjugate vaccines. Mucosal immunization targeting the lungs is an attractive alternative for the induction of local immune responses to improve protection against pneumonia. Our group had previously described the development of poly(glycerol adipate-co-ω-pentadecalactone) (PGA-co-PDL) polymeric nanoparticles (NPs) adsorbed with Pneumococcal surface protein A from clade 4 (PspA4Pro) within L-leucine microcarriers (nanocomposite microparticles-NCMPs) for mucosal delivery targeting the lungs (NP/NCMP PspA4Pro). NP/NCMP PspA4Pro was now used for immunization of mice. Inoculation of this formulation induced anti-PspA4Pro IgG antibodies in serum and lungs. Analysis of binding of serum IgG to intact bacteria showed efficient binding to bacteria expressing PspA from clades 3, 4 and 5 (family 2), but no binding to bacteria expressing PspA from clades 1 and 2 (family 1) was observed. Both mucosal immunization with NP/NCMP PspA4Pro and subcutaneous injection of the protein elicited partial protection against intranasal lethal pneumococcal challenge with a serotype 3 strain expressing PspA from clade 5 (PspA5). Although similar survival levels were observed for mucosal immunization with NP/NCMP PspA4Pro and subcutaneous immunization with purified protein, NP/NCMP PspA4Pro induced earlier control of the infection. Conversely, neither immunization with NP/NCMP PspA4Pro nor subcutaneous immunization with purified protein reduced bacterial burden in the lungs after challenge with a serotype 19F strain expressing PspA from clade 1 (PspA1). Mucosal immunization with NP/NCMP PspA4Pro targeting the lungs is thus able to induce local and systemic antibodies, conferring protection only against a strain expressing PspA from the homologous family 2

Diminished mental- and physical function and lack of social support are associated with shorter survival in community dwelling older persons of Botswana

<p>Abstract</p> <p>Background</p> <p>Mortality rates for older persons in Botswana have been unavailable and little is known of predictors of mortality in old age. This study may serve as a precursor for more detailed assessments.</p> <p>The objective was to assess diminished function and lack of social support as indicators of short term risk of death.</p> <p>Methods</p> <p>A national population based prospective survey was undertaken in Botswana; twelve rural areas and three urban centers were included.</p> <p>372 community-dwelling persons aged sixty years and over, were included; 265 were followed-up. Sixteen subjects were deceased at follow-up.</p> <p>Subjects were interviewed and clinically assessed at home. Measures of cognitive function, depression and physical function and sociodemographic information were collected. Subjects were followed-up at average 6.8 months after baseline.</p> <p>Results</p> <p>Overall mortality rate was 10.9 per 100 person years. Age-adjusted odds ratios (OR) for death during follow-up were; 4.2 (CI 1.4–12.5) and 3.6 (CI 1.0–12.7) for those with diminished physical- and cognitive function, respectively.</p> <p>Indicators of limited social support; household with only 1 or 2 persons and eating alone, yielded age adjusted ORs of 4.3 (CI 1.5–12.5) and 6.7 (CI 2.2–20), respectively, for death during follow-up.</p> <p>Conclusion</p> <p>Older community dwelling persons with diminished cognitive- or physical function, solitary daily meals and living in a small household have a significantly increased risk of rapid deterioration and death.</p> <p>Health policy should include measures to strengthen informal support and expand formal service provisions to older persons with poor function and limited social networks in order to prevent premature deaths.</p

Systematic Single-Cell Analysis of Pichia pastoris Reveals Secretory Capacity Limits Productivity

Biopharmaceuticals represent the fastest growing sector of the global pharmaceutical industry. Cost-efficient production of these biologic drugs requires a robust host organism for generating high titers of protein during fermentation. Understanding key cellular processes that limit protein production and secretion is, therefore, essential for rational strain engineering. Here, with single-cell resolution, we systematically analysed the productivity of a series of Pichia pastoris strains that produce different proteins both constitutively and inducibly. We characterized each strain by qPCR, RT-qPCR, microengraving, and imaging cytometry. We then developed a simple mathematical model describing the flux of folded protein through the ER. This combination of single-cell measurements and computational modelling shows that protein trafficking through the secretory machinery is often the rate-limiting step in single-cell production, and strategies to enhance the overall capacity of protein secretion within hosts for the production of heterologous proteins may improve productivity

Nanowell-Based Immunoassays for Measuring Single-Cell Secretion: Characterization of Transport and Surface Binding

Arrays of subnanoliter wells (nanowells) provide a useful system to isolate single cells and analyze their secreted proteins. Two general approaches have emerged: one that uses open arrays and local capture of secreted proteins, and a second (called microengraving) that relies on closed arrays to capture secreted proteins on a solid substrate, which is subsequently removed from the array. However, the design and operating parameters for efficient capture from these two approaches to analyze single-cell secretion have not been extensively considered. Using numerical simulations, we analyzed the operational envelope for both open and closed formats, as a function of the spatial distribution of capture ligands, their affinities for the protein, and the rates of single-cell secretion. Based on these analyses, we present a modified approach to capture secreted proteins in-well for highly active secreting cells. This simple method for in-well detection should facilitate rapid identification of cell lines with high specific productivities.National Institutes of Health (U.S.)/National Institute of Allergy and Infectious Diseases (U.S.) (5P01AI045757)National Cancer Institute (U.S.) (Koch Institute Support (Core) Grant P30-CA14051