Influence of Grazing Intensity on Nutrient Concentrations in Grass Tissue: Evidence from Two Savannah Grass Species

High grazing intensity can accelerate the recycling of animal nutrients on savannah rangelands through the deposition of dung and, subsequently, nutrient mineralisation, uptake and concentration in grass tissue. The actual magnitude of this influence can vary depending on the grazing system. This study derived grazing system-dependent magnitudes of the influence of grazing intensity on concentrations of major (N, P, K, Ca, Mg, Na) and trace (B, Co, Cu, Cr, Fe, Mn, Mo, Ni, Se, Zn) animal nutrients in above ground grass tissue. Two grass species were examined: Brachiaria nigropedata, a decreaser, and Eragrostis lehmanniana, an increaser. For the species, leaf, stem and flower samples were collected in close proximity from respective sampling points in wildlife and livestock grazing sites, and a no-grazing control site. Sampling was conducted at the end of the rainy season in the semi-arid savannah rangelands of north-western South Africa. The concentrations of the nutrients were determined in the laboratory using standard methods. B. nigropedata had higher nutrient concentrations than E. lehmanniana. Samples from high grazing intensity sites had higher nutrient concentrations than the control site, an effect more pronounced in B. nigropedata. Such sites also had low grass cover, a characteristic of grazing lawns. They included the open access communal rangelands and the vicinity of artificial water holes. The two species manifested inter-site covariance in nutrient concentrations, indicating that sites under high grazing intensity generally had high nutrient concentrations in grass tissue, and vice versa. The short, nutrient-rich grass in grazing lawns is attractive to grazers, which can widen the lawns by perpetuating high grazing intensity and low grass biomass. However, not all grazers are adapted to grazing short lawn grass, which can have implications on grazer diversity. The study concludes that grazing-induced increase in nutrient concentrations in grass tissue manifests more in inherently high-nutrient species

Effects of Proximity to Roads on Tissue Surface PH, Conductivity and Heavy Metal Contents of a Grazing Grass Species

Globally, road networks are expanding in the countryside. Though beneficial to society, the roads potentially have detrimental effects on grazing quality. The effects are seldom quantified. In this study Eragrostis lehmanniana, a common native grazing grass in parts of the world, was examined for indicative data on the impacts of roads on grasses. Aboveground tissue samples were collected monthly on three occasions during the growing season, at the same respective locations near three high traffic highways. Non-senescent specimens were sampled along transects of up to 400 m perpendicular to the highways, starting from the road edge and then at intervals of at least 10 m. Concurrent control samples were collected at a site more than 3 km from a road. In the laboratory, a whole stem of each specimen was washed in 40 ml of distilled water, whose pH and electrical conductivity were then measured. Heavy metal concentrations (HMC) in dry grass tissue were determined using ICP-MS analysis. Consistently, tissue surface pH was lower, and electrical conductivity higher, close to the road edge than farther away. Heavy metal concentrations were high close to the road edge, some (Fe, Ni) beyond the tolerable limits of cattle and gazelle-like grazers. Using the respective control site means as thresholds, linear regression of pH and conductivity against distance showed that the effects were pronounced for 70 m – 600 m from the road edge. The low pH was due to acidity caused by motor vehicle- emmited nitrogen and sulpher oxides (NOx, SOx) reacting with atmospheric water vapour. High conductivity and HMC were judged to be due to motor vehicle-sourced metal elements and particulate matter. Spacing roads at least 1.2 km apart in grazing areas is recommended to reduce the detrimental effects

HIV in Children in a General Population Sample in East Zimbabwe: Prevalence, Causes and Effects

There are an estimated half-million children living with HIV in sub-Saharan Africa. The predominant source of infection is presumed to be perinatal mother-to-child transmission, but general population data about paediatric HIV are sparse. We characterise the epidemiology of HIV in children in sub-Saharan Africa by describing the prevalence, possible source of infection, and effects of paediatric HIV in a southern African population.From 2009 to 2011, we conducted a household-based survey of 3389 children (aged 2-14 years) in Manicaland, eastern Zimbabwe (response rate: 73.5%). Data about socio-demographic correlates of HIV, risk factors for infection, and effects on child health were analysed using multi-variable logistic regression. To assess the plausibility of mother-to-child transmission, child HIV infection was linked to maternal survival and HIV status using data from a 12-year adult HIV cohort.HIV prevalence was (2.2%, 95% CI: 1.6-2.8%) and did not differ significantly by sex, socio-economic status, location, religion, or child age. Infected children were more likely to be underweight (19.6% versus 10.0%, p = 0.03) or stunted (39.1% versus 30.6%, p = 0.04) but did not report poorer physical or psychological ill-health. Where maternal data were available, reported mothers of 61/62 HIV-positive children were deceased or HIV-positive. Risk factors for other sources of infection were not associated with child HIV infection, including blood transfusion, vaccinations, caring for a sick relative, and sexual abuse. The observed flat age-pattern of HIV prevalence was consistent with UNAIDS estimates which assumes perinatal mother-to-child transmission, although modelled prevalence was higher than observed prevalence. Only 19/73 HIV-positive children (26.0%) were diagnosed, but, of these, 17 were on antiretroviral therapy.Childhood HIV infection likely arises predominantly from mother-to-child transmission and is associated with poorer physical development. Overall antiretroviral therapy uptake was low, with the primary barrier to treatment appearing to be lack of diagnosis

Household-based cash transfer targeting strategies in Zimbabwe: are we reaching the most vulnerable children?

Census data, collected in July 2009, from 27,672 children were used to compare the effectiveness, coverage and efficacy of three household-based methods for targeting cash transfers to vulnerable children in eastern Zimbabwe: targeting the poorest households using a wealth index; targeting HIVaffected households using socio-demographic information (households caring for orphans, chronicallyill or disabled members; child-headed households); and targeting labour-constrained households using dependency ratios. All three methods failed to identify large numbers of children with poor social and educational outcomes. The wealth index approach was the most efficient at reaching children with poor outcomes whilst socio-demographic targeting reached more vulnerable children but was less efficient.publishedVersio

Malaria Knowledge and Bed Net Use in Three Transmission Settings in Southern Africa

Background: Insecticide-treated nets (ITNs) reduce malaria morbidity and mortality in endemic areas. Despite increasing availability, the use of ITNs remains limited in some settings. Poor malaria knowledge is a barrier to the widespread use of ITNs. The goal of this study was to assess the levels of malaria knowledge and evaluate factors associated with bed net use among individuals residing in three regions of southern Africa with different levels of malaria transmission and control. Methods: A cross-sectional study was conducted on a sample of 7535 residents recruited from 2066 households in Mutasa District, Zimbabwe (seasonal malaria transmission), Choma District, Zambia (low transmission) and Nchelenge District, Zambia (high transmission), between March 2012 and March 2017. A standardized questionnaire was used to collect data on demographics, malaria-related knowledge and use of preventive measures. Multivariate logistic regression analyses were used to assess determinants of bed net use. Results: Most of the 3836 adult participants correctly linked mosquito bites to malaria (85.0%), mentioned at least one malaria symptom (95.5%) and knew of the benefit of sleeping under an ITN. Bed net ownership and use were highest in Choma and Nchelenge Districts and lowest in Mutasa District. In multivariate analyses, knowledge of ITNs was associated with a 30-40% increased likelihood of bed net use after adjusting for potential confounders across all sites. Other factors significantly associated with bed net use were age, household size and socioeconomic status, although the direction, strength and size of association varied by study site. Importantly, participants aged 5-14 years had reduced odds of sleeping under a bed net compared to children younger than 5 years. Conclusion: Relevant knowledge of ITNs translated into the expected preventive behaviour of sleeping under a bed net, underscoring the need for continued health messaging on malaria prevention. The implementation and delivery of malaria control and elimination interventions needs to consider socioeconomic equity gaps, and target school-age children to ensure access to and improve utilization of ITNs

A comparison of HIV outpatient care in primary and secondary healthcare-level settings in Zimbabwe.

SETTING: Decentralisation of HIV care to nurse-led primary care services is being implemented across low- and middle-income countries in sub-Saharan Africa. OBJECTIVE: To compare services offered to clients attending for HIV care at a physician-led and a nurse-led service in Harare, Zimbabwe. DESIGN: A cross-sectional study was performed at Harare Central Hospital (HCH) and Budiriro Primary Care Clinic (PCC) from June to August 2018. An interviewer-administered questionnaire was used to collect sociodemographics, HIV treatment and clinical history from clients attending for routine HIV care. The Mann-Whitney U-test was used to evaluate for differences between groups for continuous variables. For categorical variables, the χ2 test was used. RESULTS: The median age of the 404 participants recruited was 38 years (IQR 28-47); 69% were female. Viral suppression was comparable between sites (HCH, 70% vs. PCC, 80%; P = 0.07); however, screening for comorbidities such as cervical cancer screening (HCH, 61% vs. PCC, 41%; P = 0.001) and provision of referral services (HCH, 23% vs. PCC, 13%; P = 0.01) differed between sites. CONCLUSION: Efforts to improve service provision in primary care settings are needed to ensure equity for users of health services

The human resource implications of improving financial risk protection for mothers and newborns in Zimbabwe

Peer reviewedPublisher PD

Acquired Epidermodysplasia Verruciformis Due to Multiple and Unusual HPV Infection Among Vertically-Infected, HIV-Positive Adolescents in Zimbabwe

We have characterized the EV-like dermatosis of acquired HIV in 4 adolescents. Multiple HPV types were isolated in skin tissue samples, including β-HPV, but also high levels of HPV 1 and 2. ARV did not improve the EV eruption

Examining the Gender Imbalance in the National Community Health Assistant Program in Liberia: A Qualitative Analysis of Policy and Program Implementation.

The Revised National Community Health Services Policy (2016-2021) (RNCHSP) and its program implementation, the Liberian National Community Health Assistant Program (NCHAP), exhibit a critical gender imbalance among the Community Health Assistants (CHAs) as only 17% are women (MOH, 2016). This study was designed to assess the gender responsiveness of the RNCHSP and its program implementation in five counties across Liberia to identify opportunities to improve gender equity in the program. Using qualitative methods, 16 semi structured interviews were conducted with policymakers and 32 with CHAs, other members of the community health workforce and community members. The study found that despite the Government of Liberia's intention to prioritise women in the recruitment and selection of CHAs, the planning and implementation of the RNCHSP were not gender responsive. While the role of community structures, such as Community Health Committees, in the nomination and selection of CHAs is central to community ownership of the program, unfavourable gender norms influenced women's nomination to become CHAs. Cultural, social and religious perceptions and practices of gender created inequitable expectations that negatively influenced the recruitment of women CHAs. In particular, the education requirement for CHAs posed a significant barrier to women's nomination and selection as CHAs, due to disparities in access to education for girls in Liberia. The inequitable gender balance of CHAs has impacted the accessibility, acceptability, and affordability of community healthcare services, particularly among women. Strengthening the gender responsiveness within the RNCHSP and its program implementation is key to fostering gender equity among the health workforce and strengthening a key pillar of the health system. Employing gender responsive policies and programs will likely increase the effectiveness of community healthcare services