The person is a native of Karwar and is working at Goa in an RT-PCR test kit manufacturing unit.
The Karnataka Government has enforced special surveillance in all districts that share a border with Kerala.
The source was yet to be identified and the government was according top priority to it, Kerala health minister Veena George said on Sunday.
In Changanassery the dead bat was found dead in an area overrun by wilderness in the fifth ward of the Municipality.
With this, the test results of 73 people who were in close contact with the 12-year-old boy who succumbed to the Nipah virus have returned negative.
Presently 274 people were identified as being in the primary contact list of the victim and they were being observed.
Currently, 64 people are under observation at the Kozhikode Medical College hospital, the minister added.
Truenat is an indigenous portable, battery-operated, Internet of Things-enabled RT-PCR platform developed and manufactured in India.
There is no approved preventive medicine or vaccine available at this time. Therefore, detecting cases early and preventing the spread of the virus are matters of great priority.
Health Minister Veena George said that there are 62 persons in isolation, of whom 12 are symptomatic.