Since March, 66 confirmed bird flu infections have been reported in the UnitedStates, but previous illnesses ... spreading from person to person. The H5N1 bird flu has been spreading widely ...
The bird flu that’s been making news in the UnitedStates is a virus called H5N1. Some flu viruses carried by birds cause only mild infections and are classified as low-pathogenic viruses.
The findings come at a time when outbreaks of bird flu -- a different subtype of the same influenza ... Single Mutation in H5N1Influenza Surface Protein Could Enable Easier Human Infection ...