Are you able to provide a reliable source, please? I'm very interested in this.

Edit: Thanks to u/EricCharliemella, I have found a few sources which may be of interest to others.

• [Video] Professor Dolores Cahill: Why People Will Start Dying a Few Months After the First MRNA Vaccination
• [Summary of video] What is pathogenic priming?
• [First study from video] Immunization with SARS Coronavirus Vaccines Leads to Pulmonary Immunopathology on Challenge with the SARS Virus
• [Second study from video] Informed consent disclosure to vaccine trial subjects of risk of COVID‐19 vaccines worsening clinical disease
• [Another study] Pathogenic priming likely contributes to serious and critical illness and mortality in COVID-19 via autoimmunity

Are you able to provide a reliable source, please? I'm very interested in this.