Tax Administration, Tax Incentive and SMEs’ Growth: The Moderating Effect of Firms Size

The study examined the effect of tax administration and tax incentives on the growth of small and medium enterprises in the Kumasi Metropolis of Ghana. Explanatory research design supported by the quantitative research approach was employed. Structured questionnaires were administered for the collection of the primary data from 115 SMEs operating in the metropolis. The multiple regression results revealed that tax administration accounts for a statistically significant positive weak variance in SMEs’ growth, whilst tax incentives account for a statistically significant positive moderate variance in SMEs’ growth. Firm size moderates the predictive relationship between tax administration and SMEs’ growth. Medium enterprises have higher propensity in terms of tax compliance compared to small enterprises. Medium enterprises also have higher growth potential than small enterprises. Ghana Revenue Authority should implement preferential tax policies that support SMEs growth in Ghana with much emphasis on tax incentive packages to small enterprises. &nbsp

Novel Strategies for Malaria Vaccine Design

The quest for a licensed effective vaccine against malaria remains a global priority. Even though classical vaccine design strategies have been successful for some viral and bacterial pathogens, little success has been achieved for Plasmodium falciparum, which causes the deadliest form of malaria due to its diversity and ability to evade host immune responses. Nevertheless, recent advances in vaccinology through high throughput discovery of immune correlates of protection, lymphocyte repertoire sequencing and structural design of immunogens, provide a comprehensive approach to identifying and designing a highly efficacious vaccine for malaria. In this review, we discuss novel vaccine approaches that can be employed in malaria vaccine design

Humoral Immune Response to Mixed PfAMA1 Alleles; Multivalent PfAMA1 Vaccines Induce Broad Specificity

Apical Membrane Antigen 1 (AMA1), a merozoite protein essential for red cell invasion, is a candidate malaria vaccine component. Immune responses to AMA1 can protect in experimental animal models and antibodies isolated from AMA1-vaccinated or malaria-exposed humans can inhibit parasite multiplication in vitro. The parasite is haploid in the vertebrate host and the genome contains a single copy of AMA1, yet on a population basis a number of AMA1 molecular surface residues are polymorphic, a property thought to be primarily as a result of selective immune pressure. After immunisation with AMA1, antibodies more effectively inhibit strains carrying homologous AMA1 genes, suggesting that polymorphism may compromise vaccine efficacy. Here, we analyse induction of broad strain inhibitory antibodies with a multi-allele Plasmodium falciparum AMA1 (PfAMA1) vaccine, and determine the relative importance of cross-reactive and strain-specific IgG fractions by competition ELISA and in vitro parasite growth inhibition assays. Immunisation of rabbits with a PfAMA1 allele mixture yielded an increased proportion of antibodies to epitopes common to all vaccine alleles, compared to single allele immunisation. Competition ELISA with the anti-PfAMA1 antibody fraction that is cross-reactive between FVO and 3D7 AMA1 alleles showed that over 80% of these common antibodies were shared with other PfAMA1 alleles. Furthermore, growth inhibition assays revealed that for any PfAMA1 allele (FVO or 3D7), the cross-reactive fraction alone, on basis of weight, had the same functional capacity on homologous parasites as the total affinity-purified IgGs (cross-reactive+strain-specific). By contrast, the strain-specific IgG fraction of either PfAMA1 allele showed slightly less inhibition of red cell invasion by homologous strains. Thus multi-allele immunisation relatively increases the levels of antibodies to common allele epitopes. This explains the broadened cross inhibition of diverse malaria parasites, and suggests multi-allele approaches warrant further clinical investigation

Safety and immunogenicity of multi-antigen AMA1-based vaccines formulated with CoVaccine HT™ and Montanide ISA 51 in rhesus macaques

<p>Abstract</p> <p>Background</p> <p>Increasing the breadth of the functional antibody response through immunization with <it>Plasmodium falciparum </it>apical membrane antigen 1 (<it>Pf</it>AMA1) multi-allele vaccine formulations has been demonstrated in several rodent and rabbit studies. This study assesses the safety and immunogenicity of three <it>Pf</it>AMA1 Diversity-Covering (DiCo) vaccine candidates formulated as an equimolar mixture (DiCo mix) in CoVaccine HT™ or Montanide ISA 51, as well as that of a <it>Pf</it>AMA1-MSP1₁₉fusion protein formulated in Montanide ISA 51.</p> <p>Methods</p> <p>Vaccine safety in rhesus macaques was monitored by animal behaviour observation and assessment of organ and systemic functions through clinical chemistry and haematology measurements. The immunogenicity of vaccine formulations was assessed by enzyme-linked immunosorbent assays and <it>in vitro </it>parasite growth inhibition assays with three culture-adapted <it>P. falciparum </it>strains.</p> <p>Results</p> <p>These data show that both adjuvants were well tolerated with only transient changes in a few of the chemical and haematological parameters measured. DiCo mix formulated in CoVaccine HT™ proved immunologically and functionally superior to the same candidate formulated in Montanide ISA 51. Immunological data from the fusion protein candidate was however difficult to interpret as four out of six immunized animals were non-responsive for unknown reasons.</p> <p>Conclusions</p> <p>The study highlights the safety and immunological benefits of DiCo mix as a potential human vaccine against blood stage malaria, especially when formulated in CoVaccine HT™, and adds to the accumulating data on the specificity broadening effects of DiCo mix.</p

Immunization with different PfAMA1 alleles in sequence induces clonal imprint humoral responses that are similar to responses induced by the same alleles as a vaccine cocktail in rabbits

<p>Abstract</p> <p>Background</p> <p>Antibodies to key <it>Plasmodium falciparum </it>surface antigens have been shown to be important effectors that mediate clinical immunity to malaria. The cross-strain fraction of anti-malarial antibodies may however be required to achieve</p> <p>strain-transcending immunity. Such antibody responses against <it>Plasmodium falciparum </it>apical membrane antigen 1 (<it>Pf</it>AMA1), a vaccine target molecule that is expressed in both liver and blood stages of the parasite, can be elicited through immunization with a mixture of allelic variants of the parasite molecule. Cross-strain antibodies are most likely elicited against epitopes that are shared by the allelic antigens in the vaccine cocktail.</p> <p>Methods</p> <p>A standard competition ELISA was used to address whether the antibody response can be further focused on shared epitopes by exclusively boosting these common determinants through immunization of rabbits with different <it>Pf</it>AMA1 alleles in sequence. Th<it>e in vitro </it>parasite growth inhibition assay was used to further evaluate the functional effects of the broadened antibody response that is characteristic of multi-allele vaccine strategies.</p> <p>Results</p> <p>A mixed antigen immunization protocol elicited humoral responses that were functionally similar to those elicited by a sequential immunization protocol (p > 0.05). Sequential exposure to the different <it>Pf</it>AMA1 allelic variants induced immunological recall of responses to previous alleles and yielded functional cross-strain antibodies that would be capable of optimal growth inhibition of variant parasites at high enough concentrations.</p> <p>Conclusions</p> <p>These findings may have implications for the current understanding of the natural acquisition of clinical immunity to malaria as well as for rational vaccine design.</p

Dynamics on the field: a focused study on the culture and context of pediatric pain management at four Ghanaian hospitals

BackgroundAs part of efforts to develop and implement a short course educational program on pediatric pain management, the current study sought to understand the culture and contextual factors that influence children’s pain management in order to improve the practice in pediatric care settings.MethodsGuided by Bourdieu’s theory of practice, a focused ethnographic study was conducted from October, 2018 to February, 2019. The study was contextualized at four Ghanaian hospitals among purposefully sampled nurses, physicians, hospitalized children and their families. During the 20-week study period, three ethnographers spent 144 h conducting participant-observation sessions. Formal and informal interviews were held with participants in addition to review of hospital records.ResultsAnalysis of the field data resulted in four themes. “Children’s pain expression and response of caregivers” described the disposition (habitus) of both children and caregivers to act in particular ways due to children’s incomplete health status (bodily capital) which caused them pain and also resulted in discomforting procedures. “Pharmacological pain management practices and attitudes” elucidated the use of analgesics as the mainstay disposition (habitus) in children’s pain management due to high level of respect (symbolic capital) given to such interventions on the pediatric units (field). “Managing pain without drugs” illustrated healthcare providers and family caregivers’ disposition (habitus) of using diverse nonpharmacological methods in managing children’s pain. “Communication and interaction between pain actors” depicted how children’s access to care givers (social capital) can serve as a powerful tool in influencing pediatric pain assessment and management disposition (habitus) on the pediatric units (field).ConclusionsThe habitus of pediatric pain actors toward pain assessment and management practices are influenced by various forms of capital (social, cultural, symbolic, bodily and economic) operating at different levels on the pediatric care field. Quality improvement programs that seek to enhance pediatric pain management should use the insights obtained in this study to guide the development, implementation and evaluation stages.</p

Final Year Nursing Students' Knowledge and Attitudes regarding Children's Pain

Pain is one of the commonest reasons why children visit the hospital. Inadequately treated pain in children can negatively affect their physical, psychological, and social well-being; it also places financial burden on families of affected children and healthcare systems in general. Considering the eventual suffering of vulnerable children and their families if nursing students are insufficiently educated and ill-prepared, the current study aimed at assessing final year nursing student's knowledge and attitudes pertaining to pediatric pain. A descriptive cross-sectional study was conducted among 100 final year undergraduate nursing students at a private university college in Ghana. In addition to their ages and gender, the students responded to the 42 individual items on the Pediatric Nurses' Knowledge and Attitudes Survey regarding pain (PNKAS) instrument. Descriptive statistical analysis was aided by the Statistical Package for Social Sciences version 25 software. The mean age of the final year nursing students was 29 years (range of 21 to 47 years); a majority of them were females (78%). Participants had an average (SD) correct answer score of 44.0% (10.6%). Good pediatric pain knowledge and attitudes were observed in items that were related to the individualized and multidimensional nature of the pain experience and its treatment, benefits of pre-emptive analgesia, pharmacodynamics, and pain assessment. Poor pediatric pain knowledge and attitudes occurred in items that focused on pain perceptions, opioid drug administration, useful pain medications, pain physiology, and nonpharmacological pain management interventions. Final year nursing students have insufficient knowledge and attitudes toward children's pain management. Areas of good and poor pediatric pain knowledge and attitudes should be considered when designing and implementing educational interventions on this subject. Curricular revisions should be made on existing nursing curriculum to lay more emphasis on children's pain management and use educational interventions that support knowledge translation for improved care

The Quantity and Quality of African Children's IgG Responses to Merozoite Surface Antigens Reflect Protection against Plasmodium falciparum Malaria

Contains fulltext : 81196.pdf (publisher's version ) (Open Access)BACKGROUND: Antibodies, particularly cytophilic IgG subclasses, with specificity for asexual blood stage antigens of Plasmodium falciparum, are thought to play an important role in acquired immunity to malaria. Evaluating such responses in longitudinal sero-epidemiological field studies, allied to increasing knowledge of the immunological mechanisms associated with anti-malarial protection, will help in the development of malaria vaccines. METHODS AND FINDINGS: We conducted a 1-year follow-up study of 305 Senegalese children and identified those resistant or susceptible to malaria. In retrospective analyses we then compared post-follow-up IgG responses to six asexual-stage candidate malaria vaccine antigens in groups of individuals with clearly defined clinical and parasitological histories of infection with P. falciparum. In age-adjusted analyses, children resistant to malaria as well as to high-density parasitemia, had significantly higher IgG1 responses to GLURP and IgG3 responses to MSP2 than their susceptible counterparts. Among those resistant to malaria, high anti-MSP1 IgG1 levels were associated with protection against high-density parasitemia. To assess functional attributes, we used an in vitro parasite growth inhibition assay with purified IgG. Samples from individuals with high levels of IgG directed to MSP1, MSP2 and AMA1 gave the strongest parasite growth inhibition, but a marked age-related decline was observed in these effects. CONCLUSION: Our data are consistent with the idea that protection against P. falciparum malaria in children depends on acquisition of a constellation of appropriate, functionally active IgG subclass responses directed to multiple asexual stage antigens. Our results suggest at least two distinct mechanisms via which antibodies may exert protective effects. Although declining with age, the growth inhibitory effects of purified IgG measurable in vitro reflected levels of anti-AMA1, -MSP1 and -MSP2, but not of anti-GLURP IgG. The latter could act on parasite growth via indirect parasiticidal pathways

A Meta-Analysis of Modifications of Root System Traits of Crop Plants to Potassium (K) Deprivation

Unlike nitrogen (N) and phosphorus (P), morphological responses of root systems of crop plants to potassium (K) dynamics in soils or growth media are only gaining currency. This is due to the realization of the instrumental role of K in several cellular and tissue level processes crucial for the growth, stress tolerance, metabolic functions, and yield of crop plants, and ultimately, food security and sustainable agriculture. This chapter used meta-analysis to synthesize the pooled evidence for modifications in several root system traits of different crop plants under conditions of K starvation in different growth media. In all, 37 studies that passed inclusion/exclusion criteria, from 1969 to 2019, were analyzed in aggregate and then disaggregated for root biomass, root length, and the number of roots. Three moderators were analyzed: type of soil or growth medium, crop, and K fertilizer applied in the included studies. The aggregated results show that the cumulative effect of K deprivation was a significant and large reduction (about 25.5 ± 15.0%) in the bulk of root system traits considered, which was slightly lower than the reduction in shoot- or yield-related traits. Reductions of approximately 38 ± 38.0% in root biomass and 23.2 ± 18.6% in root length were observed, and the magnitudes of reduction were comparable to those observed from the disaggregated data. Though reductions in root system traits due to K starvation occurred under both greenhouse/lab and field conditions, the cumulative reduction in the former was significantly larger than that of the latter. Among the moderators, the effect of type of soil (or growth media) and crop on the scale of modification of root system traits to K deprivation are stronger compared to the effect of type of K fertilizer applied. It is concluded that, overall, K deprivation leads to significant reductions in root system traits, especially root biomass and length in soils and perlite regardless of the type of K fertilizer applied. Attention should be given to K management in cropping systems to avoid K starvation, especially at the early and vegetative stages, and to improve K reserves in soils. Further attention should be given to the responses of root system traits to K supply when matching crops to soils