India, Feb. 25 -- The US Centers for Disease Control and Prevention (CDC) has said in a routine flu update that two people, in Wyoming and Ohio, have been hospitalized with H5N1 bird flu. While the patient from Ohio has been released, the Wyoming patient is still in the hospital. Both the patients experienced "respiratory and non-respiratory symptoms," the report said.

"This shows that H5N1 can be very severe and we should not assume that it will always be mild," said Angela Rasmussen, a virologist at the Vaccine and Infectious Disease Organization at the University of Saskatchewan.

This is being considered one of the worst seasonal flu outbreaks in 15 years. There are concerns about a more dangerous virus emerging, combining bird flu a...