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Dr. John Campbell on Global respiratory epidemiology
Dr. John Campbell(@drjohncampbell)Sovereign
7/1/2026
Core perspective shared by Dr. John Campbell (Campbell Teaching (Over 3M YouTube Subscribers)):
"Population Vitamin D Prophylaxis: Ensuring community serum 25-hydroxyvitamin D levels remain above 40 ng/mL to maintain mucosal immune defenses."
Key Works: Campbell's Physiology Notes, Daily Epidemiological Video Syntheses.
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