The school Sunday said on its website that a third student tested positive for the H1N1 virus.

'One student from Class 8 contracted the virus in UK but has not joined school since returning from UK,' the website said.

Earlier, a Class 6 girl of the school was suspected to be down with swine flu. The school then said it would remain closed till Monday. However, she tested negative for the virus Friday.

According to the website, Sanskriti school mainly caters to the children of bureaucrats and defence personnel.

India has reported four deaths due to swine flu. Delhi has 179 confirmed cases of the viral infection.