The time the immunizations would last varies. Remember when you got your shots, some are a one time deal. Like the polio do it once and you are good to go. Same with small pox if I recall.
Tetnus is once every 7 years. It could last longer but hey, better safe than sorry. And I am going to imagine before deploying most troops would be given booster shots. And probably such would be available into about 97, maybe 98.
Then again, as you said Paul, people will be weakened, which will make them more suseptible to disease, and if they already have the immunization but the bugs take hold well they could be lime some of the infections that are now considered antibiotic resistant, the immunitiy being weakened would only force the disease to mutate and create a new strain that is totaly resistant to the immunization even if the victim were healthy and well within their immunization.
Imagine a couple more strains of diseases that sweep the countryside like the plague of old.
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