The goal of the proposed study is to assess the prevalence of intestinal parasitic diseases in adults and children. These invasions are included to "dirty hand diseases" (per os invasions), therefore it applies mainly preschool children.

It is estimated that 75% of the world's population is infected with parasites and although parasitic diseases are mostly observed in the poor tropical and subtropical countries, there are also many diseases caused by parasites in Poland. In Poland, particular attention is paid to the following parasitic diseases closely related to the digestive system: giardiasis, taeniasis (including cysticercosis), ascariasis, cryptosporidiosis, toxoplasmosis, trichinosis, echinococcosis.

Symptoms of such invasions may include: allergic rhinitis of unknown origin, chronic fatigue or food intolerance. Moreover, many of them are asymptotic, therefore the study group will consist of both healthy people and individuals with undiagnosed diseases or/and chronic symptoms.

Inclusion Criteria:

• healthy and ailing individuals
• men and females
• adults and children

Exclusion Criteria:

• the participants were not be: incapacitated persons, soldiers, prisoners and persons dependent in any way from the investigators

Healthy people and inviduals with undiagnosed diseases or/and chronic symptoms such as: hay fever, skin and food allergies or eg. chronic fatigue.