Indian authorities are rushing to contain a Nipah virus outbreak after five cases were reported and nearly 100 people quarantined in the eastern state of West Bengal, The Independent reports.

Three new infections were reported earlier last week, authorities said, adding to two existing cases of nurses, one male and one female, who had earlier tested positive. The nurses were working at a private hospital in Barasat near the state capital of Kolkata.

The new confirmed cases included a doctor, a nurse, and a health staff member, news wire agency Press Trust of India reported.

One patient is in critical condition.

The Nipah virus, like COVID-19, is transmitted from bats. It is transmitted to humans from animals or through contaminated food, causing severe encephalitis and respiratory infections. Symptoms include high fever, headache, muscle aches, and fatigue. Nipah can also be accompanied by coughing, difficulty breathing, and pneumonia.

There is no vaccine or treatment for the Nipah virus, and its mortality rate is as high as 80 percent—dozens of times higher than that of COVID-19.