There is no vaccine for the Nipah virus, which is spread through body fluids and can cause encephalitis, or inflammation of the brain, the World Health Organization (WHO) says. The usual treatment is to provide supportive care.
The first death in the outbreak in Kerala took place on Friday, the state's health minister, KK Shailaja, said.
"This is a new situation for us. We have no prior experience in dealing with the Nipah virus," she said. "We are hopeful we can put a stop to the outbreak."
The central government has sent a team of officials from the National Centre for Disease Control (NCDC) to investigate the outbreak. "Since all the contacts are under observation and steps to avoid exposure through animal vectors have been taken, there is no reason for people to panic," it added.
Samples from those bats were among the 60 sent to laboratories to be screened for the virus, it added.
Health officials in Kerala, which attracts many tourists, aims to soon issue a travel advisory, tourism official P Bala Kiran said.
The Nipah virus was first detected in Malaysia in 1998, and India has suffered two outbreaks in the last decade, killing 50 people, according to the WHO.
(Reporting by Munsif Vengattil in Bengaluru and D Jose in Kochi; Additional reporting and writing by Zeba Siddiqui; Editing by Euan Rocha and Clarence Fernandez)
Get the latest election news, live updates and election schedule for Lok Sabha Elections 2019 on ndtv.com/elections. Like us on Facebook or follow us on Twitter and Instagram for updates from each of the 543 parliamentary seats for the 2019 Indian general elections.