Selection of appropriate on-site household sanitation options for rural communities of Zimbabwe - case of Mbire district, Zimbabwe.

Selecting an appropriate sanitation option involves multiple stakeholders with often conflicting objectives. A multiple criteria decision analysis (MCDA) framework was developed to inform decision makers on selecting appropriate sanitation options for rural communities. Criteria established from literature were evaluated and weighted on-line by stakeholders. A performance matrix was developed by assigning weights to criteria and scoring alternatives. Selection of alternatives was based on a composite appropriateness index from a rank using the simple multi-attribute ranking technique. The framework was evaluated by verification, validation and sensitivity analysis. Five alternatives were evaluated on 14 decision criteria. The first preferred alternative was the urine diverting dry toilet (72.54) then the Blair ventilated improved pit latrine (67.10). The framework was commented as reasonable and robust. A simple and transparent MCDA framework was developed considering local conditions in a participatory manner to select appropriate alternatives for rural sanitation where a single option is encouraged.

The Relationship between Benthic Macroinvertebrate Assemblages and Water Quality Parameters in the Sanyati Basin, Lake Kariba, Zimbabwe.

Biological monitoring of reservoirs is important in assessing aquatic health. This study aimed at assessing the structure of benthic macroinvertebrate communities in relation to physicochemical parameters along Sanyati basin shoreline in Lake Kariba, Zimbabwe. Six sites (S1 to S6) characterized by various human disturbances were sampled for physicochemical parameters and benthic macroinvertebrates from January to March 2018. We computed macroinvertebrate metrics and classified them into functional feeding groups (FFGs). A canonical correspondence analysis (CCA) triplot was constructed to assess species-physicochemical relations. Significant differences across the sampling sites were observed for pH, electrical conductivity, turbidity, nitrate-nitrogen (NO3-N), ammonium nitrogen (NH4-N), total nitrogen (TN), phosphate-phosphorus (PO4-P), total phosphates (TP), and dissolved oxygen (DO). The results from CCA highlighted that S1 was generally associated with high pH, NH4-N, and TN, and Oligochaeta, Syrphidae, and Hydrophilidae families. The highest percentage of EPT taxa (39.83%) was recorded at S6, while the lowest was recorded at S1. The taxa were made up of 50% predators, 26% collector-gatherers, 6% scrappers, 6% shredders, and 3% collector-filters with 3 taxa (Chironomidae, Hydropsychidae, and Leptoceridae) having more than two FFGs. Site S1 had a significantly higher mean abundance of collector-gatherers than the other sites. A high correlation between water parameters and SASS and ASPT scores was observed indicating their ability to detect environmental changes. These findings suggest that macroinvertebrate communities are good candidates for delineating the effects of industrial pollution on water quality.

Drivers and barriers to sustained use of Blair ventilated improved pit latrine after nearly four decades in rural Zimbabwe.

BACKGROUND: Some latrines remain unused even under conditions of high coverage in rural areas of low- and middle-income countries. Not much is known on household latrine use in the long term in the absence of an intervention. The current work assesses drivers and barriers to sustained use of a ventilated improved pit latrine (Blair VIP) design where it originated and how rural households adapt it to climate change. METHODS: A mixed methods study was conducted from November 2020 to May 2021 among rural households of Mbire district, Zimbabwe. A cross sectional survey of 238 households with Blair ventilated improved pit (BVIP) latrines was conducted using a questionnaire and a latrine observation checklist. Data were analysed using logistic regression. Qualitative data were collected using six focus groups among house heads and analysed by thematic analysis. RESULT: The latrine has perceived health, non-health and hygiene benefits for its sustained use. However, there are design, environmental and social barriers. The quantitative study indicated that determinants of latrine use were contextual (individual and household levels) and technology (individual level) factors. Focus groups indicated that latrine use was influenced by social, technology and contextual factors at multiple level factors. Interplay of factors influenced the intention to adapt the BVIP latrine to climate change. Local climate change adaptation strategies for the latrine were odour and erosion control, construction of the conventional latrine design and raised structures. CONCLUSION: The conventional BVIP latrine design is durable and relatively resilient to climate change with high local household use. High construction cost of the latrine causes households to build incomplete and poor quality designs which affect odour and fly control. These are barriers to sustained latrine use. The government should implement the new sanitation policy which considers alternative sanitation options and offer community support for adapting sanitation to climate change.

Frameworks for selecting appropriate rural sanitation technology options in low- and middle-income countries: a critical review.

Several rural technology options exist on the sanitation market with different characteristics, yet project failures in some developing countries were attributable to inappropriate technology choices. Frameworks that are used to select sanitation technology options (hard copy, computer programmes) were developed by researchers and project implementers. They vary in design and application as there is no standard format. This appears to create a gap between science and practice. Frameworks should have some key elements needed to select appropriate sanitation technologies. We evaluated 12 available frameworks (2000-2019) used to select sanitation technologies in rural communities of low- and middle-income countries against 22 assessment criteria derived from literature. Criteria that were not fully addressed by some of the reviewed frameworks (scores of 8-50%) included equity, sanitation demand, sanitation behaviour change, ongoing contact, replicability, framework limitations, personnel selection and flexibility. Addressing such limitations may assist in future framework development.

Risk factors for food poisoning among self-catering university students.

Limited research has investigated self-catering university students' food hygiene practices that may increase their vulnerability to food poisoning. This study assessed the practice-related risk factors for food poisoning among 600 self-catering university students. A validated questionnaire was self-administered to collect data about their food hygiene practices in the previous 12 months. Factors associated with the prevalence of food poisoning were determined using logistic regression methods. Analyses showed significant associations of the use of wooden chopping boards and the consumption of unwashed fruits, with the prevalence of food poisoning (p < 0.05). However, the strongest association was for thawing of meat at room temperature (odds ratio for thawing at room temperature versus inside refrigerator, 6.07, 95% CI 3.98-9.25). Findings highlight the need for risk-based food hygiene training to inculcate safe food handling practices among self-catering university students.

Effect of Sanitation Interventions on Health Outcomes: A Systematic Review of Cluster-Randomized Controlled Trials in Rural Communities of Low- and Middle-Income Countries.

A systematic review of published literature (2000-2019) evaluating the impact of sanitation interventions on the prevalence of disease, parasite infestation, and/or child growth using randomized controlled trials (RCTs) was done according to the PRISMA checklist. Earlier reviews indicated mixed evidence citing relatively poor quality evidence from mixed designs. Public health policy and practice appear to rely on evidence from RCTs. Records were searched in six electronic databases. The methodological quality of RCTs was assessed using the Cochrane collaboration risk of bias tool. Fifteen records (2.0%) were included for review. Impact trials were done in rural communities of African and Asian countries. The significant effect of sanitation-focus interventions was found in one trial for the prevalence of childhood diarrhea (14.3%), three trials for parasite infestation (37.5%), and two trials (25.0%) for child growth. Results indicate mixed quality evidence from RCT designs. Evidence is limited and suggestive of the impact of sanitation on parasite infestation and child growth. Further rigorous sanitation intervention trials under varying settings are needed to show what really works and under what settings. Future work may explore sanitation behavior change strategies and latrine options to address the challenges of poor latrine use under high sanitation coverage.

Standing working posture and musculoskeletal pain among Citrus sinensis workers in a low-income country.

Background. Work-related musculoskeletal pain (WRMP) among Citrus sinensis farm workers has barely been studied. Yet most work tasks in such farms are manually performed using awkward standing postures that can contribute to WRMP. Aim. This study assessed the standing working posture in relation to WRMP among C. sinensis workers. Methods. Ninety-two workers engaged in manual tasks participated in this cross-sectional study. Postures at the upper limbs were analysed using the rapid upper limb assessment (RULA) method. Data were analysed using SPSS version 20. Results. Analyses generally showed statistically significant associations (p < 0.05) between a body part RULA score and WRMP at the concerned body part. The upper arm score was >1 in 77.2% of the workers and caused upper arm pain in 66.3%; the association between the upper score and upper pain was statistically significant (χ 2 = 20.57; p < 0.05). Similarly, significant associations were found between: (a) wrist score and wrist pain; (b) neck score and neck pain; (c) trunk score and back pain. Conclusions. C. sinensis workers use unsafe postures which contribute to WRMP at the upper arm, trunk, neck and wrists. Ergonomics measures are required to improve their working posture.

Food safety knowledge, attitudes and practices of restaurant food handlers in a lower-middle-income country.

Global research attention appears to be focused predominantly on self-reported than observed food safety practices. The purpose of this study was to determine the food safety knowledge, attitudes, and self-reported and observed practices of food handlers in 22 urban restaurants in Zimbabwe. A piloted questionnaire was used to gather qualitative data regarding socio-demographic variables, food safety knowledge (FSK), attitudes, and self-reported food handling practices (SRFHPs). A predesigned checklist was used to observe the food handling practices. FSK scores were significantly higher in food handlers who received basic food safety training compared to those who did not (p < .05). No differences in food safety knowledge and attitudes were noted based on the socio-demographic characteristics of the food handlers (p > .05). A significant positive correlation was observed between FSK and attitudes (r s = 0.371, p < .05), FSK and SRFHPs (r s = 0.242, p < 0.05), FSK and observed food handling practices (OFHPs) (r s = 0.254, p < .05), attitudes and SRFPs (r s = 0.229, p < .05), and attitudes and OFHPs (r s = 0.263, p < .05). About half of the food handlers washed their hands in sinks meant for washing cutlery, 57% did not use approved hand drying methods, and 19.8% did not adequately thaw frozen foods. Food was commonly defrosted either under room temperature or using hot water (>45°C). Results suggest a need for mandatory basic and advanced training to improve the food safety knowledge, attitudes, and practices.

Postural risk associated with Wooden Steel Chairs and Stackable Arm Chairs in a low-income country.

BACKGROUND: Wooden Steel Chairs (WSCs) and Stackable Arm Chairs (SACs) are widely used in tertiary institutions of learning in low income countries. No local studies seem to have investigated the postural risk associated with the concerned chair type. OBJECTIVE: This study aimed to evaluate the postural risk associated with WSCs and SACs. It also determined the anatomical distribution of musculoskeletal complaints among users of the chair types. METHODS: Purposive sampling was used to select 100 desktop computer users (23.25±1.6 years) of which 50% consistently used a computer laboratory with WSCs and the other half used one with SACs. The Rapid Upper Limb Assessment (RULA) method was used to evaluate the sitting posture of users of both chair types. Musculoskeletal complaints were investigated using the Nordic musculoskeletal questionnaire. RESULTS: Analyses showed significantly higher (p < 0.05) mean RULA scores for the right side of the body for users of WSCs (6.08±0.85) compared to users of SACs (5.26±1.23). Statistically significant differences (p < 0.05) were found on the prevalence of lower back pain between users of WSCs and SACs. Among all study participants, 72% reported musculoskeletal pain at one or more body parts in the previous 12 months. Self-reported complaints pertained to the neck (24%), lower back (19%), shoulders (16%), elbow (8%), upper back (8%) and wrist (4%). CONCLUSION: WSCs seem to pose a higher postural risk for lower back pain than SACs. Ergonomics interventions and exercise training programmes may be useful to address the poor working posture and musculoskeletal complaints.

Factors associated with safe food handling practices in the food service sector.

PURPOSE: This review assessed the methodological quality of relevant food safety studies, investigated the available evidences for factors associated with safe food handling practices (SFHPs) and suggested required improvements. METHODS: A systematic literature search was carried out in five databases. A pre-designed criteria was used for data extraction and quality assessment. Evidence synthesis was performed, based on specified criteria. RESULTS: Out of a total of 1768 published research articles, 28 met the inclusion criteria. Strong evidence suggests that food handlers' knowledge and attitudes on food safety contribute to SFHPs. Moderate evidence exists about the association between a food handler's food safety training and SFHPs. Limited evidence is available about the influence of the educational level and work experience of a food handler, to SFHPs. Insufficient evidence exists about the association between socio-demographic characteristics and SFHPs. A conceptual framework is presented to illustrate the associations. CONCLUSIONS: Available evidence supports that in order to promote SFHPs, responsible authorities should focus on improving on the food safety knowledge and attitudes of food handlers. Future food safety studies may richly benefit from overcoming the methodological shortcomings presented in this review.

Trace Elements in Leaf Extracts of Eucalyptus grandis Traditionally Used to Treat Common Cold and Flu.

BACKGROUND: Eucalyptus species have been used for the remediation of mine tailings dams in Zimbabwe. However, a traditional medicinal remedy (TMR) for the treatment of mild acute respiratory infections, such as common cold and flu includes the use of Eucalyptus leaves. OBJECTIVES: The aim of the present study was to determine total concentrations of selected potentially toxic trace elements (PTEs) in gold mine tailings and leaves of Eucalyptus grandis and to identify extractable fractions of PTEs in leaves via boiling for 10 minutes in water, which is the process used to create TMRs to treat common cold and flu. METHODS: Mine tailings and leaves of E. grandis were randomly collected at a gold mine tailings dam between April and June 2019. They were digested for laboratory analysis using standard analytical methods. Leaves were boiled in water for 10 minutes to prepare the TMR as practiced by the local community. The concentrations of PTEs were determined spectrometrically. Significant differences between PTEs in young and mature leaves were determined by analysis of variance. RESULTS: Mine tailings were acidic (pH 4.52±0.62) with very low content of organic matter (0.02%) and contained PTEs in increasing concentrations of cadmium (Cd) < nickel (Ni) < lead (Pb) < chromium (Cr) < copper (Cu) < zinc (Zn) (n = 27). Mature leaves of E. grandis had higher concentrations than young leaves for Cr, Pb and Zn (p <0.05) which were lower than permissible limits in medicinal plants. Overall, boiling leaves in water for 10 minutes resulted in low extraction of PTEs (< 20%). PARTICIPANT CONSENT: Obtained. CONCLUSIONS: Concentrations of PTEs in leaves and leaf extracts of E. grandis were very low. However, TMRs should not be prepared from medicinal plants growing on metalliferous environments, such as mine tailings dams, due to the presence of cumulative toxins such as Cd and Pb. Further studies are needed to investigate the effect of various boiling times and should include arsenic in the studied PTEs. COMPETING INTERESTS: The authors declare no competing interests for this study.

Current Status and the Future of Occupational Safety and Health Legislation in Low- and Middle-Income Countries.

This article addresses three key issues. First, the commonalities, differences, strengths, and limitations of existing occupational safety and health (OSH) legislation of low- and middle-income countries were determined. Second, required revisions were identified and discussed to strengthen the laws in accordance with the best international practice. Finally, proposals for additional OSH laws and interventions were suggested. A literature search of OSH laws of 10 selected low- and middle-income countries was carried out. The laws were subjected to uniform review criteria. Although the agricultural sector employs more than 70% of the population, most of the reviewed countries lack OSH legislation on the sector. Existing OSH laws are gender insensitive, fragmented among various government departments, insufficient, outdated, and nondeterrent to perpetrators and lack incentives for compliance. Conclusively, the legal frameworks require reformation and harmonization for the collective benefit to employees, employers, and regulatory authorities. New OSH legislation for the agricultural sector is required.

Assessment of trace element contamination of urban surface soil at informal industrial sites in a low-income country.

Trace elements released by human activity are ubiquitously detected in surface soil. The trace element contamination statuses of 20 sampling stations at two busy informal industrial sites of Harare city, Zimbabwe, were evaluated using geochemical indices. Spectrophotometric determinations of concentrations of trace elements in surface soil indicated generally higher values than the reference site and the average upper earth's crust. High contamination factors were observed for trace elements across sampling stations at Gazaland and Siyaso informal industrial sites. Concentrations exhibited heterogeneous distribution of trace elements in surface soil varying with the nature of activity at a sampling station. The pollution load index and degree of contamination suggested highly contaminated surface soil with Cd, Cu and Pb particularly where the following activities were done: (1) welding, (2) automobile maintenance and (3) waste dumping. These results may be very important to reduce soil contamination. Paving surfaces may help to reduce dispersal of trace elements deposited on surface soil to other stations and minimise human exposure via inhalation and contact.

Commentary on the Organisation of Occupational Health and Safety in Southern Africa, the International Labour Organization and Policies in General.

BACKGROUND: The design and implementation of sound occupational health and safety (OHS) programmes require understanding of the main issues that need attention. This article highlights key issues regarding the (i) organisation of OHS services in southern Africa, (ii) role of the International Labour Organization (ILO) in the provision of OHS services and (iii) implementation of policies in general. METHODS: Relevant peer-reviewed journal articles, ILO conventions and policies were identified and discussed. RESULTS: Inadequacies that exist on the organisation of OHS services in southern Africa include (i) lack of some critical categories of OHS practitioners, (ii) no emphasis on the surveillance of the work environment (iii) disregard of the worker's right to refuse to work in unsafe work environments and (iv)non-coverage of some sectors of the economy. Further research is needed to identify additional efforts that the ILO requires to effectively discharge its OHS promotion mandate. CONCLUSION: Responsible authorities need to attend to the shortcomings of the national OSH laws and intergovernmental pacts.