Levterova, V., Simeonovski, I., Brankova, N., Ivanova, M., Philipova, I., & Malcheva, M. (2023). A CASE REPORT OF A CHILD DIAGNOSED WITH FIVE SEROTYPES / SEROGROUPS OF S. PNEUMONIAE . PROBLEMS of Infectious and Parasitic Diseases, 50(2), 5-7. https://doi.org/10.58395/pipd.v50i2.87