Indian health officials are scrambling to contain a deadly virus after five cases of the incurable disease were detected near one of the country's biggest cities.
The bat-borne Nipah virus has been identified in West Bengal, close to the state capital Kolkata,
India's third-most populous city, prompting urgent contact tracing and quarantines.
Authorities confirmed that three new infections were reported this week, according to officials cited by the Press Trust of India news agency.
They include a doctor, a nurse, and a health staff member. Two nurses - one male and one female - had already tested positive earlier.
Both were working at the private Narayana Multispecialty Hospital in Barasat, around 15 miles north of Kolkata.
Narayan Swaroop Nigam, the principal secretary of the department of health and family, said one of the two nurses is in critical condition after both developed high fevers and respiratory issues between New Year's Eve and January 2, The Telegraph reports.
The critically ill nurse, who is now in a coma, is believed to have contracted the infection while treating a patient suffering from severe respiratory problems.
That patient died before tests could be carried out.
In response, officials have tested 180 people and quarantined 20 high-risk contacts as fears grow of further spread.
Nipah virus spreads between animals and humans, most commonly from infected bats or pigs, and can also be transmitted from person to person.
Fruit bats, which are widespread across India's cities and countryside, are the virus's natural hosts.