The problem with effective antibiotics
and antiviral medications is that bacteria and viruses, over time, can circumvent "the enemy" by mutating and becoming resistant to them. That seems to have happened with 31 strains of the H1N1 virus; they are immune to Tamiflu, according to the World Health Organization. The good news is that so far, those strains are still susceptible to other antiviral medication on the market , Relenza.
Another current issue to be reckoned with is that pharmacies are reporting shortages of Tamiflu; this is partially due to the new protocol the CDC has come up with to "manage" information and patient care during this flu season. The agency relies on state and local health departments to keep them apprised of hospitalizations and deaths from the flu. Some states provide them with only laboratory confirmed H1N1 illnesses, while other states are not so exact.
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Source: http://www.foodconsumer.org/newsite/Non-food/Drug/some_h1n1_strains_showing_tamiflu_resistance_121020090627.html 
