Bauer, Amy E, Olivas, Sonora, Cooper, Maria et al. · BMC veterinary research · 2015 · DOI
Researchers tested milk samples from 316 dairy farms in Indiana to see how common a bacterium called Coxiella burnetii is in cattle herds. This bacterium causes Q fever, which can lead to chronic fatigue in people. They found that over 61% of Indiana dairy herds had evidence of this bacterium in their milk, suggesting it is widespread among cattle.
Understanding the prevalence and strain diversity of Coxiella burnetii in food-producing animals is important because this pathogen is established as a causative agent of both acute Q fever and chronic fatigue syndrome in humans. This epidemiologic data helps identify environmental and occupational exposures relevant to ME/CFS patients and may inform prevention strategies in at-risk populations.
This study does not prove that Coxiella burnetii exposure causes ME/CFS, nor does it establish the proportion of chronic fatigue cases attributable to this pathogen. The presence of bacterial DNA in milk does not confirm infectious transmission to humans or characterize the risk of infection from dairy product consumption. Cross-sectional design cannot determine causality or establish whether infection occurred before or after symptom onset in any population.
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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