Officials in India’s state of Kerala have closed some schools and offices after five cases of the Nipah virus were confirmed.

BBC News reports that two people have died so far, while three others, including a child, are being treated in hospital.

The is the fourth Nipah outbreak in Kerala since 2018.

The Nipah virus is a “zoonotic illness” transmitted from animals like pigs and fruit bats to humans and can also be transmitted through contaminated food and through contact with an infected person.

People who contract the virus sometimes show no noticeable symptoms, while others show signs of acute respiratory problems.

The mortality rate among those who contract the virus is high as there is no medicine or vaccine available to treat the infection.