Drug-resistant flu strains throwing doctors a curve

Not long ago, when infectious-disease specialist Connie Price saw a patient hospitalized with flu at Denver Health Medical Center, she had a powerful weapon at hand: a drug that could shorten the course of the illness and lessen its misery.

Now, the strength of that weapon, Tamiflu, has been undermined by a widely circulating flu strain, type A H1N1, that has developed the ability to resist the drug.

http://www.usatoday.com/news/health/2009-03-22-flu-resistance_N.htm