[Serotyping and analysis of produced pigments kinds by Pseudomonas aeruginosa clinical isolates].

Background/aim: Pseudomonas aeruginosa (P. aeruginosa) is divided into 20 serotypes on the base of the International Antigenic Typing Scheme. P. aeruginosa serotyping is important because of few reasons but epidemiological is the most important. The aim of the study was serotyping of P. aeruginosa clinical isolates, analysing of single clinical isolates P. aeruginosa present in the particular samples, and analysing of pyocianin and fluorescin production in different isolates of P. aeruginosa.

Methods: A total of 223 isolates of P. aeruginosa, isolated in the microbiological laboratory of the Health Center "Aleksinac", Aleksinac, were examinated. P. aeruginosa isolates were put on the pseudomonas isolation agar, pseudomonas agar base, acetamid agar, asparagin prolin broth, pseudomonas asparagin broth, Bushnnell-Haas agar, cetrimid agar base, King A and King B plates, plates for pyocianin production, plates for fluorescin production and tripticasa soya agar (Himedia). Polyvalent and monovalent serums were used in the agglutination (Biorad). Pigment production was analysed on the bases of growth on the plates for pyocianin and fluorescin production.

Results: Serologically, we identificated the serovars as follows: O1, O3, O4, O5, O6, O7, O8, O10, O11 and O12. O1 (38%) was the most often serovar, then O11 (19%) and O6 (8.6%). A total of 18.6% (42) isolates did not agglutinate with any serum, whereas 21 isolates agglutinated only with polyvalent serum. The majority of P. aeruginosa isolates produced fluorescin, 129 (58.54%), 53 (22.94%) produced pyocianin whereas 49 (21.21%) isolates produced both pigments.

Conclusion: P. aeruginosa was isolated most of the from urine, sputum and other materials. The majority often serovars were O1, O6 and O11. The most of isolates produced fluorescin (58.54%), while 22.94% producted pyocianin and 21.21% both pigments.