Njoku, Mary Gloriac C, Jason, Leonard A, Torres-Harding, Susan R · Journal of health psychology · 2007 · DOI
This study measured how common ME/CFS is in Nigeria and found it occurs more often there than in similar studies done in the United States. The researchers suggest that illnesses like malaria and typhoid, combined with limited access to healthcare and poverty, may make people more likely to develop chronic fatigue. This highlights that ME/CFS may affect different populations around the world in different ways.
Most ME/CFS research has focused on developed countries, leaving knowledge gaps about how the disease manifests globally. This study draws attention to ME/CFS burden in developing nations and suggests that environmental and socioeconomic factors may influence disease prevalence, which could inform prevention and management strategies worldwide.
This study does not prove that malaria, typhoid, or poverty directly cause ME/CFS, only that they correlate with higher fatigue rates. The cross-sectional design cannot establish causation or temporal relationships. The study also does not clarify whether higher prevalence reflects true differences in disease occurrence or differences in symptom recognition and healthcare-seeking behavior.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
The first block is for the primary paper and is the citation you should use in research work. The atlas-snapshot line only applies if you are specifically referring to this atlas’s reading of the paper on the date shown.
Primary citation
Njoku, Mary Gloriac C, Jason, Leonard A, & Torres-Harding, Susan R (2007). The prevalence of chronic fatigue syndrome in Nigeria.. Journal of health psychology. https://doi.org/10.1177/1359105307076233
BibTeX
@article{mecfsatlas-njoku-2007-prevalence-chronic,
author = {Njoku, Mary Gloriac C and Jason, Leonard A and Torres-Harding, Susan R},
title = {The prevalence of chronic fatigue syndrome in Nigeria.},
journal = {Journal of health psychology},
year = {2007},
doi = {10.1177/1359105307076233},
note = {PubMed: 17439996},
url = {https://www.mecfsatlas.com/evidence/njoku-2007-prevalence-chronic},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-29. https://www.mecfsatlas.com/evidence/njoku-2007-prevalence-chronic
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