H7N9 case has drug- and non-resistant strains

The only H7N9 patient so far in Taiwan was carrying two strains of the same virus, with one being drug resistant and the other not, making it tricky to treat to him, doctors said. Huang Li-min, a doctor from National Taiwan University Hospital (NTUH), explained that it was possible the avian flu virus was not drug resistant when the patient was first infected, but mutated later to become resistant to Tamiflu.  ....YourHealth | H7N9 case has drug- and non-resistant strains