Lucknow, Aug 22 - Two kin of employees of the city's Sanjay Gandhi Post-Graduate Institute of Medical Sciences (SGPGIMS) have tested positive for swine flu. Health authorities are worried as the viral infection has reached the secondary stage in them, an official said Saturday.

One of the patients is the wife of an employee while the other is the teenaged daughter of another employee.

'This is the first time that we have encountered active secondary infection and that too among the close kin of our institute employees,' SGPGIMS microbiology department head T.N. Dhole told IANS.

'We have admitted both of them in a special isolation ward dedicated to swine flu patients,' he said.

'We are well equipped to handle the cases and are taking adequate care to prevent the infection from being passed on to others,' the doctor added.