The middle-aged official who has been admitted to Panchkula's General Hospital in Sector 6 two days back after he complained of headache, was not being treated as a suspect, Dr Kamla Singh, Additional Director General, Health Services, Haryana, said.
"The patient even did not have fever, but he was kept in the isolation ward just as a precautionary measure," she said.
Chandigarh administration was conducting door-to-door survey in the localities close to the lake as a precautionary measure, officials said.
The residents were examined for symptoms of bird flu and were apprised of steps to be taken as a precautionary measure.
A team from National Institute of High Security Animal Diseases Laboratory (HSADL), Bhopal, was also expected to arrive here soon.