EN
In the course of studies conducted on 10 strains of Trichomonas foetus Ried. it was proved that an addition or the 1 per cent alcohol solution of cholesterol in 0,025-0,3 ml. amounts to Schneider's medium enriched by 10 per cent of horse serum and without it do not substitute the serum and cannot take place of the growth factor for Trichomonas foetus.