- Single bird flu mutation could let it latch easily to human cells, study finds The Washington Post
- Just one mutation can make H5N1 bird flu a threat to humans, California researchers say Los Angeles Times
- Bird flu in North America worries epidemiologists: Three people infected by the H5N1 virus Le Monde
- Scientists confront a mystery: Why have U.S. bird flu cases been so mild? STAT
- Single mutation in H5N1 virus may make it more infectious to humans, study finds STAT
