text: Diagnosis is based on microscopic demonstration of eggs in stool or sputum, but these are not present until 2 to 3 months after<unk> .  (Eggs are also occasionally encountered in effusion fluid or biopsy material.)  Concentration techniques may be necessary in patients with light<unk> s. Biopsy may allow diagnostic confirmation and species identification when an adult or developing fluke is recovered.
option_0: Paragonimus infection laboratory findings
option_1: Schistosomiasis physical examination
option_2: Viral gastroenteritis laboratory findings
option_3: Strongyloidiasis laboratory findings
option_4: Ascariasis physical examination
option_5: Schistosomiasis laboratory findings
option_6: Ancylostomiasis laboratory findings
option_7: Strongyloidiasis physical examination