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Current epidemiological evidence for predisposition to high or low intensity human helminth infection: a systematic review

Wright J.E., Werkman M., Dunn J.C. et al Parasites and Vectors (2018) C2

Background: The human helminth infections include ascariasis, trichuriasis, hookworm infections, schistosomiasis, lymphatic filariasis (LF) and onchocerciasis. It is estimated that almost 2 billion people worldwide are infected with helminths. Whilst the WHO treatment guidelines for helminth infecti...ons are mostly aimed at controlling morbidity, there has been a recent shift with some countries moving towards goals of disease elimination through mass drug administration, especially for LF and onchocerciasis. However, as prevalence is driven lower, treating entire populations may no longer be the most efficient or cost-effective strategy. Instead, it may be beneficial to identify individuals or demographic groups who are persistently infected, often termed as being “predisposed” to infection, and target treatment at them. Methods: The authors searched Embase, MEDLINE, Global Health, and Web of Science for all English language, humanbased papers investigating predisposition to helminth infections published up to October 31st, 2017. The varying definitions used to describe predisposition, and the statistical tests used to determine its presence, are summarised. Evidence for predisposition is presented, stratified by helminth species, and risk factors for predisposition to infection are identified and discussed. Results: In total, 43 papers were identified, summarising results from 34 different studies in 23 countries. Consistent evidence of predisposition to infection with certain species of human helminth was identified. Children were regularly found to experience greater predisposition to Ascaris lumbricoides, Schistosoma mansoni and S. haematobium than adults. Females were found to be more predisposed to A. lumbricoides infection than were males. Household clustering of infection was identified for A. lumbricoides, T. trichiura and S. japonicum. Ascaris lumbricoides and T. trichiura also showed evidence of familial predisposition. Whilst strong evidence for predisposition to hookworm infection was identified, findings with regards to which groups were affected were considerably more varied than for other helminth species. Conclusion: This review has found consistent evidence of predisposition to heavy (and light) infection for certain human helminth species. However, further research is needed to identify reasons for the reported differences between demographic groups. Molecular epidemiological methods associated with whole genome sequencing to determine ‘who infects whom’ may shed more light on the factors generating predisposition. more

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HEARTS. Technical package for cardiovascular disease management in primary health care. Evidence-based treatment protocols

World Health Organization WHO, et al. (2018) C_WHO

In many low- and middle-income countries, there is a wide gap between evidencebased recommendations and current practice. Treatment of major CVD risk factors remains suboptimal, and only a minority of patients who are treated reach their target levels for blood pressure, blood sugar and blood choles... more

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Business case for WHO immunization activities on the African continent 2018-2030 [Folder]

World Health Organization (WHO) (2018) C_WHO

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MEDBOX Annual Report 2020

Mauder, S.; and K. Geffert MEDBOX Team (2021) CC

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Namibia: Country Brief IntraHealth

IntraHealth International (2015) C1

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Emergency Field Handbook

UNICEF (2005)

A Guide for UNICEF Staff

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WHO country cooperation strategy at a glance: Syria

World Health Organization WHO; Eastern Mediterranean Region (2018) CC

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Evaluation of Protection in Humanitarian Action

Christoplos, I. and Dillon, N. with Bonino, F. ALNAP (2018) CC

This companion to the ALNAP EHA Guide offers protection-specific insights for evaluators and evaluation commissioners across the humanitarian sector. It covers the planning, data management and analysis phases of evaluation and addresses a range of challenges that – whilst not all unique to protec... more