Substances of organic origin are seeing increasing use in agriculture as rich sources of nutrients for plants. The aim of this study was to determine the microbiological contamination of sewage sludge and digestate to assess their safe use as fertilizers in Poland. The assessment of microbial soil, sewage sludge and digestate contamination was based on the total number of mesophilic bacteria and Gram-negative bacteria from the family. The presence of and spp. was identified via culture and the presence of species was determined via biochemical and molecular methods. In laboratory conditions, the survival of in soil fertilized with sewage sludge or digestate inoculated with a reference strain was determined. The average concentration of in soil, sewage sludge and digestate samples was 1.1 × 10 CFU/g, 9.4 × 10 CFU/g and 5.6 × 10 CFU/g, respectively. was detected in all sample types. From the soil samples, , , , and genera were identified the most frequently, while in sewage sludge and digestate, was predominant. Based on the results of our laboratory experiment, it can be concluded that after three weeks, fertilization with organic waste in acceptable doses does not significantly increase soil contamination with .
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