1955 Royal Free Hospital outbreak

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The building that housed the Royal Free Hospital in 1955 when the outbreak occurred
The Royal Free Hospital outbreak was a cluster outbreak of myalgic encephalomyelitis at the Royal Free Hospital in London.

Between July and November, 1955 292 members of the medical, nursing, auxiliary medical, ancillary, and administrative staff fell ill, of which 255 were admitted to the hospital.[1] The disease name myalgic encephalomyelitis was coined to describe the illness.[2]

Location[edit | edit source]

The outbreak occurred at the former site of Royal Free Hospital at 256 Grays Inn Road (WC1X) which is now the Eastman Dental Hospital.[3] (The hospital site is now in Hampstead NW3.)

Onset[edit | edit source]

Onset involved symptoms of an upper respiratory infection, sore throat, gastrointestinal disturbances including nausea and vomiting, or acute vertigo.[4]

Symptoms[edit | edit source]

Symptoms[4] included:

  • Severe headache
  • Malaise
  • Lassitude
  • Vertigo
  • Pain in limbs
  • Nausea
  • Dizziness
  • Neck stiffness, neck pain
  • Pain in back
  • Myalgia, muscle weakness, cramps, twitching
  • Depression
  • Abdominal pain
  • vomiting
  • Diplopia
  • Tinnitus
  • Diarrea
  • Swollen lymph nodes
  • paraesthesia

Usually by the second or third week of the disease, there was objective evidence of involvement of the central nervous system which appeared to be characteristic of the outbreak.

Signs[edit | edit source]

  • Low-grade fever (tended to transiently occur with relapse of symptoms)
  • Swollen lymph nodes
  • Objective sensory impariment and muslce tenderness
  • Extensor plantar responses
  • Nystagmus
  • Diplopia

Findings[edit | edit source]

"Evidence of involvement of the sympathetic nervous system or actual hypothalamic damage was to be found in most cases. This often took the form of orthostatic tachycardia chilliness of the extremities with increased sensitivity to cold, circulatory impairment and hypothermia."[4]

Epidemiology[edit | edit source]

Between 13 July 1955 and 24 November 1955, two hundred ninety-two (292) people, of whom the vast majority were hospital personnel, became ill. Personnel from the medical, nursing, auxiliary medical, ancillary, and administrative departments were affected. Of these two hundred fifty-five (255) were admitted to the hospital.[5] Despite the hospital census being near capacity, only 12 patients were afflicted.[6]

By 5 October 1955, the hospital had to close to contain the outbreak. The first to report ill were a resident doctor and a ward sister.[7] More females became ill than males, but at the time it was believed to be because of the staff's living quarters not gender, as more females than males resided at the facility.[5]

Similar cases had occurred in the population of North West London before this outbreak and sporadic cases continued to occur after the outbreak.[3]

Prognosis[edit | edit source]

For many patients, symptoms waxed and waned in intensity over a long period. A very large majority had complete recovery of neurological function.

A follow-up study found that there is one group of patients that recovers completely or nearly completely, a second that recovers but is subject to relapses and a third that shows little or no recovery, these patients remaining incapacitated.[4]

Learn more[edit | edit source]

See also[edit | edit source]

References[edit | edit source]

  1. The Medical Staff Of The Royal Free Hospital (October 19, 1957). "An Outbreak of Encephalomyelitis in the Royal Free Hospital Group, London, in 1955". British Medical Journal. 2: 895–904. 
  2. Wikipedia - Royal Free Hospital
  3. 3.0 3.1 3.2 3.3 3.4 3.5 Ramsay, Melvin; O'Sullivan, E (May 26, 1956). "Encephalomyelitis simulating poliomyelitis". The Lancet. 270: 761–764. 
  4. 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Ramsay, A. Melvin (November 1978). "'Epidemic neuromyasthenia' 1955-1978". Postgraduate Medical Journal. 54: 718–721. 
  5. 5.0 5.1 5.2 Compston, N.D. (1978). "An outbreak of encephalomyelitis in the Royal Free Hospital Group, London, in 1955" (PDF). Postgraduate Medical Journal. 54: 722–724. 
  6. Melvin Ramsay, "Post-viral fatigue: The saga of the Royal Free Disease", 1984.
  7. Dawson, J. (1987). Royal Free disease: perplexity continues. British Medical Journal (Clinical Research Ed.), 294(6568), 327–328.


The information provided at this site is not intended to diagnose or treat any illness.

From MEpedia, a crowd-sourced encyclopedia of ME and CFS science and history