Both had toured abroad and contacted the disease there, and were found positive with the virus on their return to Delhi. Both are under medication.

Meanwhile, some students on the campus were seen wearing masks to ward off any infection. However, the institute has not issued any guidelines to students on foreign trips.

'To be honest you cannot stop such diseases when it is capable of spreading through air. This is the summer internship time and you cannot stop students from getting exposure abroad,' said a senior administrator at the institute.