Stool samples over several days (excretion of parasites can be erratic)
Wet mount slide preparation: large 150-200um ovoid shape with cilia, swimming aimlessly in circles
If suspect infection of pulmonary system, perform BAL
Balantidium coli
Entamoeba histolytica
Bacteroides fragilis
Shigella
Giardia lamblia
Salmonella
Enterobius
Campylobacter