>In the meantime, the principle of herd immunity is well understood whether you're a physician or not.

Agreed.

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>Depends what "practice" means. Epidemiologist physicians are still practicing even though they never dirty their hands on a patient. It seems that all "professionals" may not be the same.

I've worked with some Epidemiologists when I worked in WIC and even with the CDC. You'll have to excuse my generalization, but I put their usefulness just slightly above attorneys.