Turabian, Jose Luis. “Effectiveness of the Fourth Dose: Clinical-Epidemiological Comparison Between Covid-19 Infections in Vaccinated People With and Without 4th Dose of Vaccines Bivalent MRNA in the Period from October 2022 to February 2023”. International Research in Medical and Health Sciences 6, no. 1 (May 31, 2023): 11-22. Accessed April 17, 2026. http://www.irmhs.com/index.php/irmhs/article/view/110.