Plague Test

This is a test meant to stimulate consideration of values.  There are no right or wrong answers, although some choices are probably more desireable than others.

Imagine a situation similar to that in the Bruce Willis film 12 Monkeys.   An airborne plague is distributed all over the world.  It has a germination period of about 30 days and is expected to reach every person in the world within 2 months.  There is a homeopathic antidote available but there is only enough of the active ingredient available to produce a pill that is 99% effective for 10% of the world population.  1% of the population has natural immunity to the plague.  A weak almost-placebo version can be produced for the 90% of the people who cannot be given the full version.  The placebo will have a 1% effectivity so it will save some people.  If someone takes more than one of the full dose tablets it will amount to an overdose and produce the plague rather than prevent it.  The tablets all appear the same to the recipients.  Only the top level of distributors know which are placebo and which are full dose.

Who do you give the placebo and who do you give the full dose?