Phylogenetic Lineages and Diseases Associated with Isolates Recovered from Bulgarian Patients.

has been recognized as an important cause of upper respiratory tract and middle ear infections in children, as well as chronic obstructive pulmonary disease and chronic bronchitis in adults. We aim to study the clonal structure, antimicrobial resistance, and serotypes of strains recovered from patients of different ages. Nasopharyngeal swabs, middle ear fluid, and sputum samples were collected.