Chandigarh is partially relieved when the results showed negative for H1N5 virus infection in three individuals.
The risk of human transmission of the virus in Chandigarh is low as the movement of the infected birds was restricted to the lake.
Nasopharyngeal and oropharyngeal samples were taken from three suspected cases in Chandigarh all of whom reported upper respiratory tract infections reported sources in the National Centre for Disease Control (NCDC).
The ministry today said human health situation in Chandigarh was under control but alarmed every resident, especially within 3-km radius of the lake, the epicentre of the outbreak, to watch out for high-grade fever; upper and lower respiratory tract infections, including pneumonia.
Health Minister JP Nadda today said the Central team, was assisting local authorities with house-to-house surveillance to detect persons who may have got exposed to the infected birds.
"The risk of human outbreak is always higher when the infected birds are in domestic and backyard poultry or duck farms," an expert said.
Recently, central authorities said lower respiratory tract infection (pneumonia) was a more serious suspected case of Avian Influenza than the upper tract infection.A Health Ministry expert overseeing Chandigarh surveillance operations said, "Anyone with pneumonia symptoms must report their sickness. People should not go near the infected area and anyone who may have in the recent past handled an infected duck, fed them from close or touched them, should watch out for symptoms of breathing difficulties."