engleski

Dirty Croatian Money: How Big is the Threat?

Aim: The objective of this study was to determine the extent of bacterial contamination, expressed as colony forming units (CFU), on individual banknotes and coins of Croatian Kuna (HRK). The purpose of the study was to define if the fear of money- transmitted diseases is founded. Methods: One- hundred twenty pieces of banknotes and coins were collected for the experiment, 10 bills of 10, 20, 50, 100, 200 and 500 HRK and 10 coins of 10, 20 and 50 Croatian Lipa and 1, 2 and 5 HRK. At the Department of Microbiology and Parasitology, Faculty of Medicine, University of Osijek, swabs were taken from money, moistened in saline, planted on blood agar and incubated for 24 hours under ambient conditions at 37 °C. After growing the bacteria, CFU were counted and replanted for further identification, which was performed in accordance with the microbiological professional standards. Results: In total, 739 bacterial CFU were grown and six bacterial species have been identified: Staphylococcus epidermidis, Staphylococcus saprophyticus, Streptococcus viridans, Bacillus sp., Klebsiella sp., Neisseria sp. Almost 30% of the money was bacteriologically clean. There were no statistical differences between the prevalence of bacterial contamination of banknotes and coins. The most common bacteria isolated was S. epidermidis (86.33%) with statistical significance both on banknotes and coins (p<0.0001). Conclusion: The identified bacterial species are mostly part of the normal human flora. Pathogenic, and potentially pathogenic bacterial species were not found on Croatian banknotes and coins in a respect for one colony of Klebsiella sp.

bacterial contamination ; normal bacterial flora ; banknotes ; coins

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