India, Feb. 1 -- Countries across Asia, and health officials in the US, are monitoring measures after India confirmed two human cases of Nipah virus. Both nurses, in West Bengal, are under surveillance, and their condition has improved, health officials confirmed this week. They have tested negative for the contagion.

The male nurse was discharged from the hospital. "The female nurse has also tested negative, but she is still under treatment at the hospital. She has been taken off ventilator support and is being kept under observation. Her condition has improved significantly, but she is still not out of danger," an official told PTI. Nearly 200 people who had contact with the confirmed cases are under observation.

After the infections ...