1. Microbiology Department, Ludwik Rydygier Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University, Torun, 85-094 Bydgoszcz, Poland
2. Clinical Microbiology Department, Dr Antoni Jurasz University Hospital No 1 in Bydgoszcz, 85-094 Bydgoszcz, Poland
3. Dr Jan Biziel University Hospital No 2 in Bydgoszcz, 85-168 Bydgoszcz, Poland