400 random stool samples were collected from equal number of males and female preschool children (3-6 years oid) attending some day care centers in Giza and Cairo Governorates.
Giardia lambia proved to exist in 37.5% of stool samples examined. Infection was more common among females (55.33%) than males (44.67%). The highest prevalence of the disease (70%) was among the group of 4-5 years old cheldren.
Shigella and Salmonella organisms were recovered from G.lambia infect ed samples in a percentages of 6% and 2.67% respectively. Shigella could also be detected in 2% of Giarida negative stool samples.