The woman, from Gajuwaka area, was admitted to a hospital with fever and body pain on January 17.
Various tests were conducted on her and her blood samples were sent to a Mumbai-based laboratory. The hospital received reports yesterday showing that she suffered from swine flu, district nodal officer for swine flu LBHS Devi told PTI here today.
The woman is undergoing treatment at an isolated ward in the private hospital.
Devi said as soon as the authorities received her reports, they conducted door-to-door surveillance in Gajuwaka and Muralinagar area (where she went to her parent's place) and gave medication to all the family members as a preventive measure.
There were no cases of swine flu in 2010 and 2011, Devi added.