Mutated H7N9 strain is drug resistant, spreadable
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2013/12/H7N9_free.jpg?fit=860%2C460&ssl=1)
Strains of the H7N9 flu virus (shown) can mutate to become drug resistant and still maintain their ability to infect cells, a new study shows.
Courtesy of WHO Collaborating Centre for Reference and Research on Influenza, National Institute of Infectious Diseases, Japan