The aim of the study was a microbiological analysis of pharyngeal swabs obtained from 158 patients with the diagnosis of pharyngitis and purulent exudates from the tonsillar crypts of 10 patients treated for chronic purulent tonsillitis. Beta haemolytic streptococci groups A, B, C and G were isolated from 30% of the patients. The most frequently isolated were Streptococcus pyogenes--12% of patients and Streptococcus group C--10.7%. Other streptococci were isolated less frequently: Streptococcus group B--44%, group G--2.5%. The majority of isolated bacteria belonged to potential pathogenic flora (70% patients). Staphylococcus aureus (37%) and Haemophilus spp. (36%) were isolated most frequently. Other bacteria were isolated in the following sequence: Moraxella catarrhalis--22%, Streptococcus pneumoniae--17% and Gram-negative rods from the Enterobacteriaceae family--6%. One case of Plaut-Vincent tonsillitis was diagnosed. Aerobic and anaerobic bacteria were isolated from purulent exudates from the tonsillar crypts of 10 patients treated for chronic purulent tonsillitis. The isolated anaerobic bacteria belonged to genus of Prevotella, Fusobacterium, Peptostreptococcus and Gemella.
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