Ratu Kadavulevu School in Tailevu had to be closed yesterday following an outbreak of diarrhoea.
Ministry of Health spokesman Shalvin Deo confirmed that 29 cases of diarrhoea were reported at the school yesterday.
And as an interim measure all 670 students of the all-boys school were sent home until the all clear is given by the ministry.
Mr Deo said following the reports of the diarrhoea cases, ministry officials met with the Ministry of Education, RKS school management and the school principal and decided to close the school until next Monday.
He said of the 29 students, some were serious and were admitted in hospital and some had been provided with medications and sent home. Mr Deo said following investigations, they had ascertained that the main cause of the outbreak was a contaminated water source.
"Our inspection reveals that the water mains were damaged and mud and debris entered the system and clogged it, causing disruption to water supply," he said.
Mr Deo said the ministry's chief health inspector and officials from the Water Authority of Fiji were at the school yesterday to conduct assessments.
"We have placed four emergency water tanks in school and water has also been carted there from the Water Authority of Fiji. We are looking at rectifying the issue as soon as possible so that classes are not disrupted," Mr Deo said.
Permanent secretary for Education Dr Brij Lal confirmed that students were sent home and the school was closed.
He said the school was facing water problems and classes were expected to normalise by Monday.
The Ministry of Health is urging members of the public to boil all drinking water as a precautionary measure.