EN
The work describes results of studies on the action of various concentrations of the preparation „Vapam" on the eggs of Ascaris suum and Ascaris lumbricoides in vitro. This preparation at the concentration 4 per cent exhibits a killing action on eggs in the course of 24 hr. A the concentration 2 per cent, 1 per cent, 0,5 per cent. 0,25 per cent and 0,125 per cent exhibits the killing action in the course of 48 hr. and at the concentration 0,1 per cent and 0,05 per cent in the course of 72 hr.