An estimated 1 billion people are infected with<unk>  worldwide. While infection occurs throughout most of the world,<unk>  infection is most common in sub-Saharan Africa, the Americas, China, and east Asia. Although the prevalence is low in the United States, the infection still exists in southeastern part of the United States due to its temperature and humid climate.<unk>  eggs are extremely resistant to strong chemicals, desiccation, and low temperatures. The eggs can remain viable in the soil for several months or even years. Eggs of<unk>  have been identified in archeological coprolites in the Americas, Europe, Africa, the Middle East, and New Zealand, the oldest ones being more than 24,000 years old.
Ascaris lumbricoides
Taenia asiatica
Entamoeba coli
Trichuris trichiura
Taenia solium
Taenia saginata
Schistosoma mansoni
Schistosoma haematobium