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Med. Pr. 2006;57(6):525-530

Exposure assessment to bioaerosols among sewer workers

Ocena narażenia na bioaerozole pracowników kanalizacji

Marcin Cyprowski, Alina Buczyńska, Irena Szadkowska-Stańczyk Nofer Institute of Occupational Medicine, Łódź, Poland

Abstract

Background: The purpose of the study was to evaluate exposure to bioaerosols among sewer workers. Materials and Methods: The study was carried out in the summertime, based on the standard PN-EN 13098. Air samples were collected on gelatinefilters at three stationary sites: inside the sewer, next to the sewer manhole during under pressure cleaning and at effluent discharge point. In collected samples the qualitative and quantitative analysis of bacteria and fungi were performed. Results: Bacteria and fungi concentrations were at low levels. The highest concentration of bacteria (about 5.0 - 102 cfu/m³) was found inside the sewer and of fungi (about 1.0 - 102 cfu/m³) at effluent discharge point. Among all determined microorganisms Gram-positive bacteria were predominated, especially Staphylococcus lentus. Others bacteria there were also found, like rod-shaped of the genus Bacillus and Enterococcus faecalis. The diversification of Gram-negative bacteria was small. Among fungi there were determined representatives of two genera Aspergillus spp. and Penicillium spp., including species Aspergillus fumigatus. Conclusions: According to the law in force among all determined microorganisms only bacteria Enterococcus faecalis (Enterococcus spp.) and mould Aspergillus fumigatus are classified as harmful biological agents (occupational risk group 2). It is suggested using by employees personal protective equipment, especially for respiratory airways and skin protection and also keeping the rules of individual hygiene.

Key words

sewer workers, occupational exposure, bioaerosols, bacteria, fungi