Source: BBC News
US authorities have asked the authors of two controversial bird flu studies to redact key details after a government advisory panel suggested the data could be used by terrorists.
The papers show how a bird flu variant can pass easily between ferrets.
Editors at the journals Science and Nature say they will not agree to the redactions until they are assured the data will be accessible to researchers.
A spokesman for US health authorities said such a system was being prepared.
Cartoon by Bob Moran
