"Almost a year after they announced it, leading influenza researchers are ending a voluntary moratorium on certain types of controversial experiments involving the H5N1 avian influenza virus," Science Insider reports (Malakoff, 1/23). "The research touched off a firestorm in 2011 when it became known that two groups, one in the Netherlands and another in the United States, had genetically altered a dangerous bird flu virus to make it more contagious in mammals," the New York Times recounts (Grady, 1/23). "Originally only for 60 days, the moratorium on the research was intended to allow research funders and public health authorities to create safeguards against such concerns," USA Today notes (Vergano, 1/23). "In a letter published on Thursday in Nature [and in Science], the lead researchers involved in working on the engineered flu virus said that the pause in research had been useful in that it provided time to communicate the public health benefits of the work and decide how to minimize the risks," the Guardian writes (Jha, 1/23). "Announcing their decision to resume what they say are risky but essential studies of the avian flu strain, the scientists said the work would only be carried out in the most secure sites in countries that agree it can go ahead," according to Reuters (Kelland, 1/23).