2009 is correct. Thanks for pointing out the concept that the efficacy of these drugs changes due to the mutations of the virus. http://en.wikipedia.org/wiki/P

2009 is correct. Thanks for pointing out the concept that the efficacy of these drugs changes due to the mutations of the virus. http://en.wikipedia.org/wiki/Pandemic_H1N1/09_virus#Nomenclature http://en.wikipedia.org/wiki/Pandemic_H1N1/09_virus#Nomencla... http://en.wikipedia.org/wiki/2009_flu_pandemic http://en.wikipedia.org/wiki/2009_flu_pandemic