Researchers focused on a population that was hard hit by a waterborne outbreak of Giardia enteritis, which included 1,262 people. They first identified a group of 96 people with long-lasting post-infectious fatigue, then evaluated this group for ME/CFS.
Of those 96 people, 58 (60%) were diagnosed with ME/CFS. That's about 4.5% of the people affected by the outbreak.
The study was conducted just over 2.5 years after the outbreak. Over that time, 57% those who's developed ME/CFS said their illness had gradually worsened, 28% said it had stayed constant, and 16% said they'd seen improvement.
Researchers noted a distinctive pattern of impairment that included poorer physical function, more fatigue and low energy, and lower rates of social functioning.
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