PAVLOVA, Dyana; TRIFONOVA, Ivelina; KORSUN, Neli; VELIKOV, Petar; IVANOV, Ivan; IVANOV, Daniel; VALKOV, Trifon; CHRISTOVA, Iva. ETIOLOGY, CLINICAL MANIFESTATIONS, AND AGE CHARACTERISTICS OF MIXED VIRAL RESPIRATORY INFECTIONS WITHIN 2024-2025. PROBLEMS of Infectious and Parasitic Diseases, Sofia, Bulgaria, v. 54, n. 1, p. 5–15, 2026. DOI: 10.58395/peq4mg59. Disponível em: https://pipd.ncipd.org/index.php/pipd/article/view/54-1-1-etiology-clinical-manifestations-and-age-characteristics. Acesso em: 14 may. 2026.