The woman's husband had died a couple of days ago and as a precautionary measure, she along with their two sons reported for testing, they said.
The tests of her two sons came out negative and the woman was hospitalised at K D Medical college, the officials said.
The area where the woman was residing has also been sealed, an official said.
On the brighter side, three COVID-19 patients were discharged from the same hospital after recovering from the infection, DM sarvagya Ram Mishra said.
A 70-year-old patient, having a problem with the heart, was among those who recovered from COVID-19, he said.
The official said of the 80 test reports received on Monday, 79 were found negative. COR CK