I say you ask for volunteers and do the study.
If we get hit with Anthrax, you may not be able to vaccinate enough people in time to prevent death.
Were I President, I’d vaccinate my children and allow a third party agency verify that my kids were carrying the antibodies.
A vaccine against Anthrax is a big, big deal. I’m very glad there are efforts within government to protect against weapons like this.
As another poster pointed out, the odds are that an anthrax attack wouldn’t be a wide-spread crisis. It would be a localized problem.
AT THAT TIME, we break up the already exposed kids into two groups - one that gets the higher dose and kids that get the lower dose. Exposed children would be at risk and it would be ethical to give them the shot. It is not ethical to give a healthy child a vaccination that may harm them when their risk of exposure to the pathogen is nearly zero.