The elder sister of the boy now feels sick and was sent to Siriraj Hospital in Bangkok.

Captain Apinan Songkramchai, a provincial commander, said that the Kilosong Tessaban kindergarten was ordered closed on Tuesday and public health officials and staff are now cleaning the premises with disinfectants.

The boy, whose name was not released, lived in Aranyaprathet district and had been suffering from the foot-and-mouth virus for about four days. His death alerted authorities which led to the closure of the kindergarten, Apinan said.

Meanwhile Kornchai Srikoon, the mayor of Muang Aranyaprathet municipality, said that he was alerted of the death of the pupil on Tuesday afternoon.

At a temple, the boy’s father said that he usually took his children to Rongklua border Market and he suspected that his boy caught the disease there.

He revealed that his daughter, aged 4, now feel sick with the same symptoms as her brother, so his wife took their daughter to hospital on Tuesday night.