LAUSR

Objectives Primary objective: to determine the point prevalence and incidence rate of severe myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) in children aged 5–16 years over 13 months. Secondary objectives: to describe the demographic features, symptoms, impact on activities of daily living, school attendance and time to diagnosis. Design Prospective surveillance study conducted by the British Paediatric Surveillance Unit. Paediatricians was asked if they had assessed a child with severe ME/CFS (screening definition for prevalence and incidence: children (5–16 years) diagnosed with ME/CFS so severe that they are unable to attend school for more than 1 hour a week during the last 6 weeks of the school term). Participants Patients 5–16 years of age, seen by paediatricians and two large ME/CFS specialist services across the UK and Ireland. Outcome measures Paediatrician-completed questionnaires describing demographics, symptoms, function and treatment, (applying National Institute for Health and Care Excellence (NICE)-recommended criteria to assess severity of ME/CFS). Diagnosis of severe, probable severe or possible severe ME/CFS was made only with evidence of NICE-recommended screening blood tests. Results 285 cases were reported, of which of which 33 were severe, 4 probable severe and 55 possible severe. Estimated prevalence was 3.2 per million children (95% CI 2.2 to 4.5). Including possible/probable severe ME/CFS gave 8.9 per million children (95% CI 7.2 to 11). The incidence rate was 0.90 per million children-years (95% CI 0.43 to 1.65) (1.97 per million children-years (95% CI 1.24 to 2.99)). Median age was 13 years and 58% of cases were female. Median time to diagnosis was 0.47 years. Conclusions Although the incidence of children presenting with severe ME/CFS is low, all were very disabled. In addition, the majority receive little or no education. Paediatricians need to consider how to provide rehabilitation and education for these disabled young people. This national study investigated prevalence and incidence rates of severe ME/CFS (Myalgic Encephalomyelitis/Chronic Fatigue Syndrome) in 5-16 year-olds, as well as describing key demographic and clinical characteristics.