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An Outbreak of Encephalomyelitis in the Royal Free Hospital Group, London, in 1955

Introduction In October, 1957, the Medical Staff of the Royal Free Hospital reported in the British Medical Journal an outbreak of an illness amongst the hospital staff in 1955. Between 13 July of that year and 24 November, 292 members of the medical, nursing, auxiliary medical, ancillary, and administrative staff were affected by the illness and, of these, 255 patients were admitted to hospital. Dr Ramsay (1978) has already stated that similar cases had occurred in the population of North West London before this outbreak and sporadic cases continued to occur after the outbreak (Ramsay and O'Sullivan, 1956). The disease was referred to as an encephalomyelitis and when the term 'benign myalgic encephalomyelitis' was subsequently introduced it was felt that the disease was best described by that title. The author has not had the opportunity of continuing to study the disorder but he certainly does not feel that the term 'epidemic neuromyasthenia' adequately describes the disorder.