'There is no need to close the schools. We only need to be careful and take precautions about the disease. The preventive measures have been sent to the schools and principals have been asked to tell the students about the do's and don'ts to avoid the disease,' Walia said.

Union Health Minister Ghulam Nabi Azad Wednesday said that there are 322 cases of swine flu in India, a sizable number of which were 'imported cases' from the US. He said the government is upgrading 16 more laboratories to tackle the virus.