EN
The experiment was carried out on 20 piglets. The vaccine was being administered per os with fodder to 10 piglets at a dose of 3 ml (1.5 X 1010 ml-1) for 10 days. The number of E. coli in the faeces was determined in 5 piglets prior to and at day 5 and 10 in the course of vaccination and at day 5, 10 and 15 after the vaccination. In the next experiment in addition to the number of E. coli the numbers of Lactabacillus, Streptococcus and Staphylococcus-Micrococcus sp. were also determined. In this experiment the number of bacteria was counted prior to and at day 5 and 10 of the vaccination, and at day 10 after vaccination. At day 10 and 15 after the vaccination there was observed a decrease of E. coli colonies. During and after vaccination an increase of Lactobacillus sp. was noticed. No differences in the number of Streptococcus or Staphylococcus-Micrococcus sp. were found in the control and experimental piglets.