In 1984 he was presented with a number of patients with a prolonged exertional 'flu-like illness, but presenting no diagnosable condition. While some people thought they were no different from commonly found "tired all the time" cases, Dr Snow was convinced that they were indeed sick and proceeded to investigate.
In 1984, he encountered a number of patients experiencing prolonged exertion-related "flu-like illness" but without any diagnosable condition. While some individuals believed they were similar to typical cases of "tired all the time," Dr. Snow was convinced that these patients were genuinely ill and embarked on an investigation.