The other cases were reported from Andhra Pradesh (8), Gujarat (5), Kerala (3), Haryana (2), West Bengal (1), Uttarakhand (1), Uttar Pradesh (1) and Chhattishgarh (1).

In Chandigarh, authorities asked doctors and paramedical staff to take extra precautions against swine flu after the virus affected some of them in government hospitals.

Four doctors and two other staffers of the administrative department of the Post Graduate Institute of Medical Education and Research (PGIMER) and the Government Hospital in Chandigarh in Sector 32 have tested positive in the past. Besides, the daughter of a senior doctor also got infected with the virus.

'Seeing the circumstances, we have instructed our doctors and other paramedical staff to remain cautious. However, there is no need to panic and the situation is well under control,' nodal officer for swine flu H.C. Gera told IANS.

According to health officials, 20 positive cases of swine flu have been detected in Chandigarh so far and of these over 25 percent are doctors and other members of the hospitals. However, no casualty has been reported so far from this disease in the region.