Scientists who created a potentially more deadly bird flu strain have temporarily stopped their research amid fears it could be used by terrorists.
In a letter published in Science and Nature, the teams call for an "international forum" to debate the risks and value of the studies.
US authorities last month asked the authors of the research to redact key details in forthcoming publications.
A government advisory panel suggested the data could be used by terrorists.
Biosecurity experts fear an altered, more contagious form of the virus could spark a pandemic deadlier than the 1918-19 Spanish flu outbreak that
killed up to 40 million people.
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