My doctor wrote prescriptions for Tamiflu for me and hubster because we both have asthma and if a really really bad flu of ANY sort hit us, well, that would possibly be all she wrote. Relenza is another flu medication that is prescription, and some authorities are saying that IF the bird flu ever DOES become something that transmits human to human, the two together might be useful.
But I still think eating healthy and taking care of yourself now is the best strategy.
As for freezing, again, the stuff does NOT need to stay frozen. It just needs to BE frozen to kill off any eggs from mealworms that might be in the flour.