All 820 staff and pupils were evacuated from Collenswood school in Stevenage, Hertfordshire, last Thursday after pupils began to develop headaches and symptoms of sickness. But a hospital spokesman said all 42 children and 13 adults left the hospital with little or no medical treatment.
A mystery illness that led to more than 50 children and adults being taken to hospital could have been an attack of mass hysteria, health officials have said.
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