“Efficacy of Arsenicum Album Phosphorus- Tuberculinum (APT) Protocol in Long-Term Prevention of COVID-19 – An Observational Study ”. Advancements in Homeopathic Research 6, no. 4 (August 23, 2022): 18–23. Accessed August 12, 2025. https://www.journals.acspublisher.com/index.php/ahr/article/view/1866.