While drug treatment has proved effective in getting rid of parasites, it is better to avoid being infected with them in the first place. Cleanliness is the best protection. Excrement should not be left exposed to the air. Toilet facilities should be a safe distance from the water source. Human waste should not be used as fertilizer.
Proper hygiene is essential as well.
In addition, don't let children eat dirt. If one child is found to have parasites, it would be a good idea to have all family members checked. Care should also be exercised in buying and preparing food. Try to buy products grown in an area that has a reputation for sanitary conditions. Meat should be well cooked in the center.