# Source note — PBC YouTubers to Follow: Dr. John Campbell

Date added: 2026-07-20

Channel: Dr. John Campbell
Channel ID: UCF9IOB2TExg3QIBupFtBDxg
Channel URL: https://www.youtube.com/@Campbellteaching
Subscriber/follower count reported by yt-dlp at capture time: 3330000


Why follow: Retired nurse teacher with a large public-health audience, often discussing studies, surveillance data and health-policy questions. Useful as a lead source when PBC covers vaccine or public-health claims.

Best PBC lane: Health-claim literacy, pandemic policy, public-health source leads.

Evidence caution: Not medical advice. Verify every health claim against primary studies, PubMed/official surveillance data, regulator notices and clinician guidance; separate data review from diagnosis/treatment advice.

Editorial rule: this watchlist is a source-radar page, not a blanket endorsement. Videos are leads, not final proof.

Artifacts preserved in this folder: yt-dlp metadata/run output, channel RSS when available, avatar image when available, and channel summary JSON.