Ablashi, D V, Berneman, Z N, Kramarsky, B et al. · In vivo (Athens, Greece) · 1994
This review examines Human herpesvirus-7 (HHV-7), a common virus that infects most people in the United States. HHV-7 was first discovered in 1990 and was found in a ME/CFS patient in 1992, raising early questions about whether it might be involved in the illness. However, researchers have not yet found clear evidence that HHV-7 causes any specific disease.
Early isolation of HHV-7 from an ME/CFS patient generated initial interest in a potential viral etiology for the condition. This review synthesizes foundational knowledge about HHV-7 epidemiology and biology, which is essential context for understanding whether this ubiquitous virus might play a role in ME/CFS pathogenesis or activation.
This review does not establish causation or prove that HHV-7 causes ME/CFS. The finding that HHV-7 is prevalent in 85% of the population but no disease has been etiologically linked to it suggests that presence of the virus alone does not explain illness. Geographic variation in prevalence (high in the U.S., low in Japan) also suggests the relationship is complex and not straightforward.
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 →
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