Tamiflu-resistant strains of flu have been found in patients who haven’t taken the drug, suggesting the mutated virus is capable of spreading between humans, according to an international team of researchers that includes a University of Wisconsin-Madison scientist.
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Experts say the study, which showed anti-viral resistance in the milder influenza B viruses, means that Tamiflu-resistant strains of other flu viruses, such as the more fatal avian flu, could spread between humans, too.