Drug resistance

Nurses leave a bird flu isolation unit at a hospital in Shanghai. Photo: AFP

Some bird flu patients resistant to only available H7N9 drug

Laboratory tests have revealed resistance in some H7N9 bird flu patients to the only available treatment, said virologists who unveiled “concerning” study results on Tuesday. Three out of 14 patients monitored at a clinic in Shanghai had a genetically-mutated version of the virus that makes it drug resistant, a team of researchers in China wrote in the journal The Lancet.