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I have also looked, in all the usual places, trying to find an answer for you. When vaccines and drugs are tested, the first subjects are generally healthy individuals, followed over time by those with a variety of medical conditions. Since the Covid vaccines were brought to market as quickly as was safe to stop the pandemic and high rates of infection, the expanded trials have been ongoing, but don't get much press. For example, just recently an article was released indicating that it was tested among people with inflammatory conditions, and found to be safe, with any side effects being treatable.

Currently, it is recommended by the CDC that individuals with blood disorders receive the vaccine if deemed safe by their physician.

How old is your son, and how severe is his anemia?

Sue