<P> An estimated 1 billion people are infected with A. lumbricoides worldwide . While infection occurs throughout most of the world, A. lumbricoides infection is most common in sub-Saharan Africa, the Americas, China, and east Asia . </P> <P> Ascaris lumbricoides 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 A. lumbricoides 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 . </P> <P> Infections with these parasites are more common where sanitation is poor, and raw human feces are used as fertilizer . </P> <P> Often, no symptoms are seen with an A. lumbricoides infection . However, in the case of a particularly bad infection, symptoms may include bloody sputum, cough, fever, abdominal discomfort, intestinal ulcer, and passing worms . Ascariasis is also the most common cause of Löffler's syndrome worldwide . Accompanying symptoms include pulmonary infiltration, eosinophilia, and radiographic opacities . Significant increases in fertility are observed in infected women . </P>

What type of host relationship is produced by ascaris