{"podcast":{"title":"Dr. John Campbell","slug":"dr-john-campbell-7851784","podcast_index_feed_id":7851784,"rss_url":"https://feeds.megaphone.fm/VG9554039150","website_url":null,"image_url":"https://megaphone.imgix.net/podcasts/7a133470-32e4-11f1-ae26-ef5a830a5f06/image/aacd596ff9b51467520b0238cfcd1c87.png?ixlib=rails-4.3.1&max-w=3000&max-h=3000&fit=crop&auto=format,compress","author":"Campbellteaching","episode_count":480,"summary":"Hello Everyone, My name is John Campbell and I am a retired Nurse Teacher and former clinical nurse based in England. I also do some teaching in Asia and Africa when time permits. These videos are to help students to learn the background to all forms of health care. My PhD focused on the development of open learning resources for nurses nationally and internationally. LinkedIn profile, https://www.linkedin.com/in/dr-john-campbell-5256223b/ Twitter, https://twitter.com/Johnincarlisle Disclaimer; These media including videos, book, e book, articles, podcasts are not peer-reviewed. They should never replace individual clinical judgement from your own health care provider. No media-based material on this channel is suitable for using as professional medical advice. All comments are also for educational purposed only and must never replace advice from your own health care provider","last_synced_at":"2026-07-23T10:19:57.883522+00:00","page_url":"https://stenobird.com/podcast/dr-john-campbell-7851784"},"episode":{"title":"Miscarrage after mRNA vaccine","slug":"miscarrage-after-mrna-vaccine","published_at":"2026-07-19T23:30:00+00:00","page_url":"https://stenobird.com/podcast/dr-john-campbell-7851784/miscarrage-after-mrna-vaccine","show_page_url":"https://stenobird.com/podcast/dr-john-campbell-7851784","url":"https://traffic.megaphone.fm/VG4549901475.mp3","audio_url":"https://traffic.megaphone.fm/VG4549901475.mp3","summary":"Check out Josh on Substack, https://researchrebel.substack.com/ Observed-to-Expected Fetal Losses Following mRNA COVID-19 Vaccination in Early Pregnancy https://www.medrxiv.org/content/10.1101/2025.06.18.25329352v1 The clinical trials used to approve COVID-19 vaccines excluded pregnant women, and existing safety assessments of COVID-19 vaccination, particularly during early stages of pregnancy, are limited to observational studies prone to various types of potential bias, including healthy vaccinee bias. Methods March 1, 2016 and February 28, 2022 N = 226,395 pregnancies Observed-to-expected comparisons mRNA COVID-19 vaccination, weeks 8-13 and 14-27 Influenza during gestational weeks 8-27 and women vaccinated prior to pregnancy for COVID-19 or influenza, used as controls. Expected number of fetal losses, historical data from 2016-2018 (that incorporates individual-level risk factors) A simulated trial, where each vaccinated pregnant woman included in the cohort was ‘matched’ with a ‘synthetic unvaccinated control’ with similar individual and pregnancy characteristics. Results COVID-19 vaccination with dose 1 during weeks 8-13 Associated with higher-than-expected fetal losses 13 versus 9 expected for every 100 exposed pregnancies 3.85 additional fetal losses above expected per 100 pregnancies Most of the excess fetal losses occurred after gestational week 20, and nearly half occurred after gestational week 25. Women vaccinated with dose 3 during weeks 8-13 A higher-than-expected number of fetal losses Nearly 1.9 additional fetal losses above expected per 100 pregnancies. In contrast, Pregnant women vaccinated for influenza during weeks 8-27 Exhibited a consistently lower-than-expected observed number of fetal losses, likely the result of healthy vaccinee bias. Women va…","meta_description":"Check out Josh on Substack, https://researchrebel.substack.com/ Observed-to-Expected Fetal Losses Following mRNA COVID-19 Vaccination in Early Pregnancy h…","key_points":[],"chapters":[],"topics":[],"duration_seconds":2559,"processing_state":"not_requested","actions":[{"name":"request_transcript","method":"POST","url":"https://stenobird.com/v1/public/podcasts/dr-john-campbell-7851784/episodes/miscarrage-after-mrna-vaccine/transcription-requests","description":"Idempotently request low-priority transcript generation for this episode."},{"name":"read_markdown","method":"GET","url":"https://stenobird.com/podcast/dr-john-campbell-7851784/miscarrage-after-mrna-vaccine.md","description":"Read the agent-friendly Markdown representation of this episode resource."}]}}