The number of students who have fallen ill from salmonella poisoning at a Chiang Mai school has risen to 460.
Health authorities say the students fell ill after eating three-day-old boiled eggs tainted with salmonella bacteria.
Dr Pornthep Siriwanarangsan, director-general of the Disease Control Department, said Chiang Mai Welfare School students became sick after eating donated eggs that were boiled three days previously and not reheated before they were consumed, allowing the bacteria to develop.
On Sunday evening, about 900 students of the school, located in Mae Rim district, ate chilli curry and donated boiled eggs at the cafeteria.
After the meal, 75 of the students became ill with headaches, high fever, nausea and diarrhoea.
The number of sick students increased to 460 yesterday, health authorities said.
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