GlaxoSmithKline is one of the handful of drug companies on the front lines of the fight against the flu.

In fact, it is the only company that has products on both sides. GSK makes a vaccine and an antiviral. In the third quarter, GSK today reported that it sold nearly $300 million worth of the inhalable flu-fighter Relenza. That’s a more than 10-fold increase from a year ago.