Dimitrova T, Paunov T, Chenkov Y. VACCINE BREAKTHROUGH CASES AMONG HOSPITALISED PATIENTS IN THE INTENSIVE CARE UNIT FOR COVID-19 IN NORTH-EASTERN BULGARIA. Probl Infect Parasit Dis [Internet]. 2024 May 7 [cited 2024 Nov. 21];52(1):29-33. Available from: https://pipd.ncipd.org/index.php/pipd/article/view/52-1-5-vaccine-breakthrough-cases